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Diffusion

Index Diffusion

Diffusion is the net movement of molecules or atoms from a region of high concentration (or high chemical potential) to a region of low concentration (or low chemical potential) as a result of random motion of the molecules or atoms. [1]

146 relations: Adolf Eugen Fick, Advection, Albert Einstein, Aleksandr Gorban, Amount of substance, Anisotropic diffusion, Anomalous diffusion, Area, Atmosphere of Earth, Atomic diffusion, Avogadro constant, Big O notation, Biology, Blood, Blood vessel, Boltzmann constant, Boltzmann equation, Boussinesq approximation (buoyancy), Brownian motion, Butterworth-Heinemann, Capillary, Carbon dioxide, Carl Wagner, Catalysis, Cementation process, Chapman–Enskog theory, Chemical kinetics, Chemical potential, Chemistry, Chinese ceramics, Conjugate variables (thermodynamics), Continuity equation, Convection, Course of Theoretical Physics, Darcy's law, Darken's equations, Diffusion current, Diffusion-limited aggregation, Dimensional analysis, Distance, Drift velocity, Earth Surface Processes and Landforms, Earthenware, Economics, Eddy diffusion, Effusion, Einstein relation (kinetic theory), Electric current, Electronics, Entropy, ..., Evgeny Lifshitz, Facilitated diffusion, False diffusion, Fick's laws of diffusion, Finance, Fluid dynamics, Force, Free entropy, Gaseous diffusion, George de Hevesy, Gradient, Heart, Heat equation, Henry Eyring (chemist), Ideal gas law, Inner product space, Intensive and extensive properties, Interstitial defect, Ion, Isobaric counterdiffusion, Isothermal process, Isotope separation, Itô diffusion, James Clerk Maxwell, Jean Baptiste Perrin, John Gamble Kirkwood, Kinesis (biology), Kinetic energy, Knudsen diffusion, Laplace operator, Lars Onsager, Latin, Lev Landau, Ludwig Boltzmann, Lung, Marian Smoluchowski, Mass flow, Maxwell–Stefan diffusion, Mean free path, Mole (unit), Molecular diffusion, Molecule, Momentum, Momentum diffusion, Non-equilibrium thermodynamics, Ohm's law, Onsager reciprocal relations, Osmosis, Oxygen, Permeation, Photon diffusion, Physical quantity, Physics, Plasma diffusion, Pliny the Elder, Positive-definite matrix, Pressure, Pressure gradient, Probability, Pulmonary alveolus, Radionuclide, Random walk, Respiration (physiology), Reverse diffusion, Robert Boyle, Robert Brown (botanist, born 1773), Rotational diffusion, Rudolf Clausius, Second law of thermodynamics, Self-diffusion, Shlomo Havlin, Sociology, Sorption, Stained glass, Statistical ensemble (mathematical physics), Surface diffusion, Temperature, Temperature gradient, Thermal conduction, Thermal conductivity, Thermodynamic activity, Thermodynamic temperature, Thermodynamics, Thermophoresis, Thomas Graham (chemist), Thoracic cavity, Transition state theory, Transport phenomena, Turbulent diffusion, Vector area, Viscosity, Walter H. Schottky, Wendell H. Furry, William Chandler Roberts-Austen, Yakov Borisovich Zel'dovich, Yakov Frenkel. Expand index (96 more) »

Adolf Eugen Fick

Adolf Eugen Fick (3 September 1829 – 21 August 1901) was a German-born physician and physiologist.

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Advection

In the field of physics, engineering, and earth sciences, advection is the transport of a substance by bulk motion.

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Albert Einstein

Albert Einstein (14 March 1879 – 18 April 1955) was a German-born theoretical physicist who developed the theory of relativity, one of the two pillars of modern physics (alongside quantum mechanics).

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Aleksandr Gorban

Alexander Nikolaevich Gorban (Александр Николаевич Горба́нь.) is a scientist of Soviet origin, working in the United Kingdom.

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Amount of substance

Amount of substance (symbol for the quantity is 'n') is a standard-defined quantity that measures the size of an ensemble of elementary entities, such as atoms, molecules, electrons, and other particles.

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Anisotropic diffusion

In image processing and computer vision, anisotropic diffusion, also called Perona–Malik diffusion, is a technique aiming at reducing image noise without removing significant parts of the image content, typically edges, lines or other details that are important for the interpretation of the image.

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Anomalous diffusion

Anomalous diffusion is a diffusion process with a non-linear relationship to time, in contrast to a typical diffusion process, in which the mean squared displacement (MSD), σr2, of a particle is a linear function of time.

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Area

Area is the quantity that expresses the extent of a two-dimensional figure or shape, or planar lamina, in the plane.

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Atmosphere of Earth

The atmosphere of Earth is the layer of gases, commonly known as air, that surrounds the planet Earth and is retained by Earth's gravity.

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Atomic diffusion

Vacancy diffusion is a diffusion process whereby the random thermally-activated movement of atoms in a solid results in the net transport of atoms.

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Avogadro constant

In chemistry and physics, the Avogadro constant (named after scientist Amedeo Avogadro) is the number of constituent particles, usually atoms or molecules, that are contained in the amount of substance given by one mole.

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Big O notation

Big O notation is a mathematical notation that describes the limiting behaviour of a function when the argument tends towards a particular value or infinity.

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Biology

Biology is the natural science that studies life and living organisms, including their physical structure, chemical composition, function, development and evolution.

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Blood

Blood is a body fluid in humans and other animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away from those same cells.

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Blood vessel

The blood vessels are the part of the circulatory system, and microcirculation, that transports blood throughout the human body.

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Boltzmann constant

The Boltzmann constant, which is named after Ludwig Boltzmann, is a physical constant relating the average kinetic energy of particles in a gas with the temperature of the gas.

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Boltzmann equation

The Boltzmann equation or Boltzmann transport equation (BTE) describes the statistical behaviour of a thermodynamic system not in a state of equilibrium, devised by Ludwig Boltzmann in 1872.

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Boussinesq approximation (buoyancy)

In fluid dynamics, the Boussinesq approximation (named for Joseph Valentin Boussinesq) is used in the field of buoyancy-driven flow (also known as natural convection).

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Brownian motion

Brownian motion or pedesis (from πήδησις "leaping") is the random motion of particles suspended in a fluid (a liquid or a gas) resulting from their collision with the fast-moving molecules in the fluid.

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Butterworth-Heinemann

Butterworth–Heinemann is a British publishing company specialized in professional information and learning materials for higher education and professional training, in printed and electronic forms.

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Capillary

A capillary is a small blood vessel from 5 to 10 micrometres (µm) in diameter, and having a wall one endothelial cell thick.

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Carbon dioxide

Carbon dioxide (chemical formula) is a colorless gas with a density about 60% higher than that of dry air.

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Carl Wagner

Carl Wilhelm Wagner (May 25, 1901 – December 10, 1977) was a German Physical chemist.

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Catalysis

Catalysis is the increase in the rate of a chemical reaction due to the participation of an additional substance called a catalysthttp://goldbook.iupac.org/C00876.html, which is not consumed in the catalyzed reaction and can continue to act repeatedly.

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Cementation process

The cementation process is an obsolete technology for making steel by carburization of iron.

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Chapman–Enskog theory

Chapman–Enskog theory presents equations for dynamics of a multicomponent gas mixture in states close to local equilibrium.

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Chemical kinetics

Chemical kinetics, also known as reaction kinetics, is the study of rates of chemical processes.

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Chemical potential

In thermodynamics, chemical potential of a species is a form of energy that can be absorbed or released during a chemical reaction or phase transition due to a change of the particle number of the given species.

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Chemistry

Chemistry is the scientific discipline involved with compounds composed of atoms, i.e. elements, and molecules, i.e. combinations of atoms: their composition, structure, properties, behavior and the changes they undergo during a reaction with other compounds.

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Chinese ceramics

Chinese ceramics show a continuous development since pre-dynastic times and are one of the most significant forms of Chinese art and ceramics globally.

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Conjugate variables (thermodynamics)

In thermodynamics, the internal energy of a system is expressed in terms of pairs of conjugate variables such as temperature and entropy or pressure and volume.

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Continuity equation

A continuity equation in physics is an equation that describes the transport of some quantity.

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Convection

Convection is the heat transfer due to bulk movement of molecules within fluids such as gases and liquids, including molten rock (rheid).

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Course of Theoretical Physics

The Course of Theoretical Physics is a ten-volume series of books covering theoretical physics that was initiated by Lev Landau and written in collaboration with his student Evgeny Lifshitz starting in the late 1930s.

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Darcy's law

Darcy's law is an equation that describes the flow of a fluid through a porous medium.

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Darken's equations

In 1948, Lawrence Stamper Darken published an article entitled "Diffusion, Mobility and Their Interrelation through Free Energy in Binary Metallic Systems", in which he derived two equations describing solid-state diffusion in binary solutions.

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Diffusion current

Diffusion current is a current in a semiconductor caused by the diffusion of charge carriers (holes and/or electrons).

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Diffusion-limited aggregation

Diffusion-limited aggregation (DLA) is the process whereby particles undergoing a random walk due to Brownian motion cluster together to form aggregates of such particles.

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Dimensional analysis

In engineering and science, dimensional analysis is the analysis of the relationships between different physical quantities by identifying their base quantities (such as length, mass, time, and electric charge) and units of measure (such as miles vs. kilometers, or pounds vs. kilograms) and tracking these dimensions as calculations or comparisons are performed.

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Distance

Distance is a numerical measurement of how far apart objects are.

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Drift velocity

The drift velocity is the average velocity that a particle, such as an electron, attains in a material due to an electric field.

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Earth Surface Processes and Landforms

Earth Surface Processes and Landforms is the journal of the British Society for Geomorphology (BSG), formerly the British Geomorphological Research Group (BGRG) and is an international journal of geomorphology, publishing on all aspects of Earth Surface Science.

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Earthenware

Earthenware is glazed or unglazed nonvitreous pottery that has normally been fired below 1200°C.

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Economics

Economics is the social science that studies the production, distribution, and consumption of goods and services.

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Eddy diffusion

Eddy diffusion, eddy dispersion, multipath, or turbulent diffusion is any diffusion process by which substances are mixed in the atmosphere or in any fluid system due to eddy motion.

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Effusion

In physics and chemistry, effusion is the process in which a gas escapes through a hole of diameter considerably smaller than the mean free path of the molecules.

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Einstein relation (kinetic theory)

In physics (specifically, in kinetic theory) the Einstein relation (also known as Einstein–Smoluchowski relation) is a previously unexpected connection revealed independently by William Sutherland in 1904, Albert Einstein in 1905, and by Marian Smoluchowski in 1906 in their papers on Brownian motion.

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Electric current

An electric current is a flow of electric charge.

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Electronics

Electronics is the discipline dealing with the development and application of devices and systems involving the flow of electrons in a vacuum, in gaseous media, and in semiconductors.

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Entropy

In statistical mechanics, entropy is an extensive property of a thermodynamic system.

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Evgeny Lifshitz

Evgeny Mikhailovich Lifshitz (Евге́ний Миха́йлович Ли́фшиц; February 21, 1915, Kharkov, Russian Empire – October 29, 1985, Moscow, Russian SFSR) was a leading Soviet physicist and the brother of physicist Ilya Mikhailovich Lifshitz.

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Facilitated diffusion

Facilitated diffusion (also known as facilitated transport or passive-mediated transport) is the process of spontaneous passive transport (as opposed to active transport) of molecules or ions across a biological membrane via specific transmembrane integral proteins.

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False diffusion

False diffusion is a type of error observed when the upwind scheme is used to approximate the convection term in convection–diffusion equations.

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Fick's laws of diffusion

Fick's laws of diffusion describe diffusion and were derived by Adolf Fick in 1855.

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Finance

Finance is a field that is concerned with the allocation (investment) of assets and liabilities (known as elements of the balance statement) over space and time, often under conditions of risk or uncertainty.

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Fluid dynamics

In physics and engineering, fluid dynamics is a subdiscipline of fluid mechanics that describes the flow of fluids - liquids and gases.

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Force

In physics, a force is any interaction that, when unopposed, will change the motion of an object.

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Free entropy

A thermodynamic free entropy is an entropic thermodynamic potential analogous to the free energy.

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Gaseous diffusion

Gaseous diffusion is a technology used to produce enriched uranium by forcing gaseous uranium hexafluoride (UF6) through semipermeable membranes.

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George de Hevesy

George Charles de Hevesy (Georg Karl von Hevesy; 1 August 1885 – 5 July 1966) was a Hungarian radiochemist and Nobel Prize in Chemistry laureate, recognized in 1943 for his key role in the development of radioactive tracers to study chemical processes such as in the metabolism of animals.

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Gradient

In mathematics, the gradient is a multi-variable generalization of the derivative.

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Heart

The heart is a muscular organ in most animals, which pumps blood through the blood vessels of the circulatory system.

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Heat equation

The heat equation is a parabolic partial differential equation that describes the distribution of heat (or variation in temperature) in a given region over time.

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Henry Eyring (chemist)

Henry Eyring (February 20, 1901 – December 26, 1981) was a Mexican-born American theoretical chemist whose primary contribution was in the study of chemical reaction rates and intermediates.

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Ideal gas law

The ideal gas law, also called the general gas equation, is the equation of state of a hypothetical ideal gas.

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Inner product space

In linear algebra, an inner product space is a vector space with an additional structure called an inner product.

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Intensive and extensive properties

Physical properties of materials and systems can often be categorized as being either intensive or extensive quantities, according to how the property changes when the size (or extent) of the system changes.

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Interstitial defect

Interstitials defects are a variety of crystallographic defects where atoms assume a normally unoccupied site in the crystal structure.

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Ion

An ion is an atom or molecule that has a non-zero net electrical charge (its total number of electrons is not equal to its total number of protons).

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Isobaric counterdiffusion

In physiology, isobaric counterdiffusion (ICD) is the diffusion of different gases into and out of tissues while under a constant ambient pressure, after a change of gas composition, and the physiological effects of this phenomenon.

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Isothermal process

An isothermal process is a change of a system, in which the temperature remains constant: ΔT.

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Isotope separation

Isotope separation is the process of concentrating specific isotopes of a chemical element by removing other isotopes.

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Itô diffusion

In mathematics — specifically, in stochastic analysis — an Itô diffusion is a solution to a specific type of stochastic differential equation.

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James Clerk Maxwell

James Clerk Maxwell (13 June 1831 – 5 November 1879) was a Scottish scientist in the field of mathematical physics.

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Jean Baptiste Perrin

Jean Baptiste Perrin (30 September 1870 – 17 April 1942) was a French physicist who, in his studies of the Brownian motion of minute particles suspended in liquids, verified Albert Einstein’s explanation of this phenomenon and thereby confirmed the atomic nature of matter (sedimentation equilibrium).

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John Gamble Kirkwood

John "Jack" Gamble Kirkwood (May 30, 1907, Gotebo, Oklahoma – August 9, 1959, New Haven, Connecticut) was a noted chemist and physicist, holding faculty positions at Cornell University, the University of Chicago, California Institute of Technology, and Yale University.

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Kinesis (biology)

Kinesis, like a taxis or tropism, is a movement or activity of a cell or an organism in response to a stimulus.

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Kinetic energy

In physics, the kinetic energy of an object is the energy that it possesses due to its motion.

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Knudsen diffusion

Knudsen diffusion is a means of diffusion that occurs when the scale length of a system is comparable to or smaller than the mean free path of the particles involved.

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Laplace operator

In mathematics, the Laplace operator or Laplacian is a differential operator given by the divergence of the gradient of a function on Euclidean space.

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Lars Onsager

Lars Onsager (November 27, 1903 – October 5, 1976) was a Norwegian-born American physical chemist and theoretical physicist.

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Latin

Latin (Latin: lingua latīna) is a classical language belonging to the Italic branch of the Indo-European languages.

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Lev Landau

Lev Davidovich Landau (22 January 1908 - April 1968) was a Soviet physicist who made fundamental contributions to many areas of theoretical physics.

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Ludwig Boltzmann

Ludwig Eduard Boltzmann (February 20, 1844 – September 5, 1906) was an Austrian physicist and philosopher whose greatest achievement was in the development of statistical mechanics, which explains and predicts how the properties of atoms (such as mass, charge, and structure) determine the physical properties of matter (such as viscosity, thermal conductivity, and diffusion).

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Lung

The lungs are the primary organs of the respiratory system in humans and many other animals including a few fish and some snails.

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Marian Smoluchowski

Marian Smoluchowski (28 May 1872 – 5 September 1917) was a Polish physicist who worked in the Polish territories of the Austro-Hungarian Empire.

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Mass flow

This article is about the flow of fluids in biological systems.

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Maxwell–Stefan diffusion

The Maxwell–Stefan diffusion (or Stefan–Maxwell diffusion) is a model for describing diffusion in multicomponent systems.

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Mean free path

In physics, the mean free path is the average distance traveled by a moving particle (such as an atom, a molecule, a photon) between successive impacts (collisions), which modify its direction or energy or other particle properties.

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Mole (unit)

The mole, symbol mol, is the SI unit of amount of substance.

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Molecular diffusion

Molecular diffusion, often simply called diffusion, is the thermal motion of all (liquid or gas) particles at temperatures above absolute zero.

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Molecule

A molecule is an electrically neutral group of two or more atoms held together by chemical bonds.

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Momentum

In Newtonian mechanics, linear momentum, translational momentum, or simply momentum (pl. momenta) is the product of the mass and velocity of an object.

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Momentum diffusion

Momentum diffusion most commonly refers to the diffusion, or spread of momentum between particles (atoms or molecules) of matter, often in the fluid state.

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Non-equilibrium thermodynamics

Non-equilibrium thermodynamics is a branch of thermodynamics that deals with physical systems that are not in thermodynamic equilibrium but can be described in terms of variables (non-equilibrium state variables) that represent an extrapolation of the variables used to specify the system in thermodynamic equilibrium.

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Ohm's law

Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

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Onsager reciprocal relations

In thermodynamics, the Onsager reciprocal relations express the equality of certain ratios between flows and forces in thermodynamic systems out of equilibrium, but where a notion of local equilibrium exists.

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Osmosis

Osmosis is the spontaneous net movement of solvent molecules through a selectively permeable membrane into a region of higher solute concentration, in the direction that tends to equalize the solute concentrations on the two sides.

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Oxygen

Oxygen is a chemical element with symbol O and atomic number 8.

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Permeation

In physics and engineering, permeation (also called imbuing) is the penetration of a permeate (such as a liquid, gas, or vapor) through a solid.

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Photon diffusion

Photon diffusion is a situation where photons travel through a material without being absorbed, but rather undergoing repeated scattering events which change the direction of their path.

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Physical quantity

A physical quantity is a physical property of a phenomenon, body, or substance, that can be quantified by measurement.or we can say that quantities which we come across during our scientific studies are called as the physical quantities...

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Physics

Physics (from knowledge of nature, from φύσις phýsis "nature") is the natural science that studies matterAt the start of The Feynman Lectures on Physics, Richard Feynman offers the atomic hypothesis as the single most prolific scientific concept: "If, in some cataclysm, all scientific knowledge were to be destroyed one sentence what statement would contain the most information in the fewest words? I believe it is that all things are made up of atoms – little particles that move around in perpetual motion, attracting each other when they are a little distance apart, but repelling upon being squeezed into one another..." and its motion and behavior through space and time and that studies the related entities of energy and force."Physical science is that department of knowledge which relates to the order of nature, or, in other words, to the regular succession of events." Physics is one of the most fundamental scientific disciplines, and its main goal is to understand how the universe behaves."Physics is one of the most fundamental of the sciences. Scientists of all disciplines use the ideas of physics, including chemists who study the structure of molecules, paleontologists who try to reconstruct how dinosaurs walked, and climatologists who study how human activities affect the atmosphere and oceans. Physics is also the foundation of all engineering and technology. No engineer could design a flat-screen TV, an interplanetary spacecraft, or even a better mousetrap without first understanding the basic laws of physics. (...) You will come to see physics as a towering achievement of the human intellect in its quest to understand our world and ourselves."Physics is an experimental science. Physicists observe the phenomena of nature and try to find patterns that relate these phenomena.""Physics is the study of your world and the world and universe around you." Physics is one of the oldest academic disciplines and, through its inclusion of astronomy, perhaps the oldest. Over the last two millennia, physics, chemistry, biology, and certain branches of mathematics were a part of natural philosophy, but during the scientific revolution in the 17th century, these natural sciences emerged as unique research endeavors in their own right. Physics intersects with many interdisciplinary areas of research, such as biophysics and quantum chemistry, and the boundaries of physics are not rigidly defined. New ideas in physics often explain the fundamental mechanisms studied by other sciences and suggest new avenues of research in academic disciplines such as mathematics and philosophy. Advances in physics often enable advances in new technologies. For example, advances in the understanding of electromagnetism and nuclear physics led directly to the development of new products that have dramatically transformed modern-day society, such as television, computers, domestic appliances, and nuclear weapons; advances in thermodynamics led to the development of industrialization; and advances in mechanics inspired the development of calculus.

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Plasma diffusion

The plasma diffusion across the magnetic field is an important topic in magnetic confinement of fusion plasma.

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Pliny the Elder

Pliny the Elder (born Gaius Plinius Secundus, AD 23–79) was a Roman author, naturalist and natural philosopher, a naval and army commander of the early Roman Empire, and friend of emperor Vespasian.

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Positive-definite matrix

In linear algebra, a symmetric real matrix M is said to be positive definite if the scalar z^Mz is strictly positive for every non-zero column vector z of n real numbers.

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Pressure

Pressure (symbol: p or P) is the force applied perpendicular to the surface of an object per unit area over which that force is distributed.

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Pressure gradient

In atmospheric science (meteorology, climatology and related fields), the pressure gradient (typically of air, more generally of any fluid) is a physical quantity that describes in which direction and at what rate the pressure increases the most rapidly around a particular location.

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Probability

Probability is the measure of the likelihood that an event will occur.

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Pulmonary alveolus

A pulmonary alveolus (plural: alveoli, from Latin alveolus, "little cavity") is a hollow cavity found in the lung parenchyma, and is the basic unit of ventilation.

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Radionuclide

A radionuclide (radioactive nuclide, radioisotope or radioactive isotope) is an atom that has excess nuclear energy, making it unstable.

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Random walk

A random walk is a mathematical object, known as a stochastic or random process, that describes a path that consists of a succession of random steps on some mathematical space such as the integers.

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Respiration (physiology)

In physiology, respiration is defined as the movement of oxygen from the outside environment to the cells within tissues, and the transport of carbon dioxide in the opposite direction.

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Reverse diffusion

Reverse diffusion refers to a situation where the transport of particles (atoms or molecules) in a medium occurs towards regions of higher concentration gradients, opposite to that observed during diffusion.

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Robert Boyle

Robert Boyle (25 January 1627 – 31 December 1691) was an Anglo-Irish natural philosopher, chemist, physicist, and inventor.

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Robert Brown (botanist, born 1773)

Robert Brown FRSE FRS FLS MWS (21 December 1773 – 10 June 1858) was a Scottish botanist and palaeobotanist who made important contributions to botany largely through his pioneering use of the microscope.

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Rotational diffusion

Rotational diffusion is a process by which the equilibrium statistical distribution of the overall orientation of particles or molecules is maintained or restored.

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Rudolf Clausius

Rudolf Julius Emanuel Clausius (2 January 1822 – 24 August 1888) was a German physicist and mathematician and is considered one of the central founders of the science of thermodynamics.

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Second law of thermodynamics

The second law of thermodynamics states that the total entropy of an isolated system can never decrease over time.

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Self-diffusion

According to IUPAC definition, self-diffusion coefficient is the diffusion coefficient D_i^* of species i when the chemical potential gradient equals zero.

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Shlomo Havlin

Shlomo Havlin (born July 21, 1942) is a Professor in the Department of Physics at Bar-Ilan University, Ramat-Gan, Israel.

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Sociology

Sociology is the scientific study of society, patterns of social relationships, social interaction, and culture.

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Sorption

Sorption is a physical and chemical process by which one substance becomes attached to another.

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Stained glass

The term stained glass can refer to coloured glass as a material or to works created from it.

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Statistical ensemble (mathematical physics)

In mathematical physics, especially as introduced into statistical mechanics and thermodynamics by J. Willard Gibbs in 1902, an ensemble (also statistical ensemble) is an idealization consisting of a large number of virtual copies (sometimes infinitely many) of a system, considered all at once, each of which represents a possible state that the real system might be in.

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Surface diffusion

Surface diffusion is a general process involving the motion of adatoms, molecules, and atomic clusters (adparticles) at solid material surfaces.

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Temperature

Temperature is a physical quantity expressing hot and cold.

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Temperature gradient

A temperature gradient is a physical quantity that describes in which direction and at what rate the temperature changes the most rapidly around a particular location.

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Thermal conduction

Thermal conduction is the transfer of heat (internal energy) by microscopic collisions of particles and movement of electrons within a body.

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Thermal conductivity

Thermal conductivity (often denoted k, λ, or κ) is the property of a material to conduct heat.

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Thermodynamic activity

In chemical thermodynamics, activity (symbol) is a measure of the "effective concentration" of a species in a mixture, in the sense that the species' chemical potential depends on the activity of a real solution in the same way that it would depend on concentration for an ideal solution.

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Thermodynamic temperature

Thermodynamic temperature is the absolute measure of temperature and is one of the principal parameters of thermodynamics.

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Thermodynamics

Thermodynamics is the branch of physics concerned with heat and temperature and their relation to energy and work.

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Thermophoresis

Thermophoresis (also thermomigration, thermodiffusion, the Soret effect, or the Ludwig–Soret effect) is a phenomenon observed in mixtures of mobile particles where the different particle types exhibit different responses to the force of a temperature gradient.

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Thomas Graham (chemist)

Thomas Graham (20 December 1805 – 16 September 1869) was a British chemist who is best-remembered today for his pioneering work in dialysis and the diffusion of gases.

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Thoracic cavity

The thoracic cavity (or chest cavity) is the chamber of the body of vertebrates that is protected by the thoracic wall (rib cage and associated skin, muscle, and fascia).

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Transition state theory

Transition state theory (TST) explains the reaction rates of elementary chemical reactions.

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Transport phenomena

In engineering, physics and chemistry, the study of transport phenomena concerns the exchange of mass, energy, charge, momentum and angular momentum between observed and studied systems.

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Turbulent diffusion

Turbulent diffusion is the transport of mass, heat, or momentum within a system due to random and chaotic time dependent motions.

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Vector area

In 3-dimensional geometry, for a finite planar surface of scalar area and unit normal, the vector area is defined as the unit normal scaled by the area: For an orientable surface composed of a set of flat facet areas, the vector area of the surface is given by where is the unit normal vector to the area.

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Viscosity

The viscosity of a fluid is the measure of its resistance to gradual deformation by shear stress or tensile stress.

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Walter H. Schottky

Walter Hans Schottky (23 July 1886 – 4 March 1976) was a German physicist who played a major early role in developing the theory of electron and ion emission phenomena, invented the screen-grid vacuum tube in 1915 and the pentode in 1919 while working at Siemens, co-invented the ribbon microphone and ribbon loudspeaker along with Dr.

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Wendell H. Furry

Wendell Hinkle Furry (February 18. 1907 – December 1984) was a professor of physics at Harvard University, and made notable contributions to theoretical and particle physics.

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William Chandler Roberts-Austen

Sir William Chandler Roberts-Austen KCB, (3 March 1843 in Kennington – 22 November 1902, London), was an English metallurgist noted for his research on the physical properties of metals and their alloys.

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Yakov Borisovich Zel'dovich

Yakov Borisovich Zel’dovich (Я́каў Бары́савіч Зяльдо́віч, Я́ков Бори́сович Зельдо́вич; 8 March 1914 – 2 December 1987), also known as YaB, was a Soviet physicist of Belarusian Jewish ethnicity, who is known for his prolific contributions in cosmology and the physics of thermonuclear and hydrodynamical phenomena.

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Yakov Frenkel

Yakov Il'ich Frenkel (Яков Ильич Френкель) (10 February 1894 – 23 January 1952) was a Soviet physicist renowned for his works in the field of condensed matter physics.

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Redirects here:

Diffuse, Diffusion rate, Rate of diffusion.

References

[1] https://en.wikipedia.org/wiki/Diffusion

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