23 relations: Arnold Sommerfeld, Binary relation, Constantin Carathéodory, Diathermal wall, Dimension, Edward A. Guggenheim, Equivalence relation, Euclidean relation, James Clerk Maxwell, James Serrin, Max Planck, Microstate (statistical mechanics), Mole (unit), Ralph H. Fowler, Real number, Reflexive relation, Second law of thermodynamics, Temperature measurement, Thermal equilibrium, Thermodynamic system, Thermodynamic temperature, Thermometer, Transitive relation.

## Arnold Sommerfeld

Arnold Johannes Wilhelm Sommerfeld, (5 December 1868 – 26 April 1951) was a German theoretical physicist who pioneered developments in atomic and quantum physics, and also educated and mentored a large number of students for the new era of theoretical physics.

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## Binary relation

In mathematics, a binary relation on a set A is a set of ordered pairs of elements of A. In other words, it is a subset of the Cartesian product A2.

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## Constantin Carathéodory

Constantin Carathéodory (Greek: Κωνσταντίνος Καραθεοδωρή Konstantinos Karatheodori; 13 September 1873 – 2 February 1950) was a Greek mathematician who spent most of his professional career in Germany.

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## Diathermal wall

In thermodynamics, a diathermal wall between two thermodynamic systems allows heat but not matter to pass across it.

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## Dimension

In physics and mathematics, the dimension of a mathematical space (or object) is informally defined as the minimum number of coordinates needed to specify any point within it.

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## Edward A. Guggenheim

Edward Armand Guggenheim FRS (11 August 1901 in Manchester – 9 August 1970) was an English physical chemist, noted for his contributions to thermodynamics.

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## Equivalence relation

In mathematics, an equivalence relation is a binary relation that is reflexive, symmetric and transitive.

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## Euclidean relation

In mathematics, Euclidean relations are a class of binary relations that formalizes "Axiom 1" in Euclid's Elements: "Magnitudes which are equal to the same are equal to each other.".

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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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## James Serrin

James Burton Serrin (1 November 1926, Chicago, Illinois – 23 August 2012, Minneapolis, Minnesota) was an American mathematician, and a professor at University of Minnesota.

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## Max Planck

Max Karl Ernst Ludwig Planck, FRS (23 April 1858 – 4 October 1947) was a German theoretical physicist whose discovery of energy quanta won him the Nobel Prize in Physics in 1918.

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## Microstate (statistical mechanics)

In statistical mechanics, a microstate is a specific microscopic configuration of a thermodynamic system that the system may occupy with a certain probability in the course of its thermal fluctuations.

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## Mole (unit)

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

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## Ralph H. Fowler

Sir Ralph Howard Fowler OBE FRS (17 January 1889 – 28 July 1944) was a British physicist and astronomer.

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## Real number

In mathematics, a real number is a value of a continuous quantity that can represent a distance along a line.

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## Reflexive relation

In mathematics, a binary relation R over a set X is reflexive if every element of X is related to itself.

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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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## Temperature measurement

Temperature measurement, also known as thermometry, describes the process of measuring a current local temperature for immediate or later evaluation.

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## Thermal equilibrium

Two physical systems are in thermal equilibrium if there are no net flow of thermal energy between them when they are connected by a path permeable to heat.

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## Thermodynamic system

A thermodynamic system is the material and radiative content of a macroscopic volume in space, that can be adequately described by thermodynamic state variables such as temperature, entropy, internal energy, and pressure.

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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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## Thermometer

A thermometer is a device that measures temperature or a temperature gradient.

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## Transitive relation

In mathematics, a binary relation over a set is transitive if whenever an element is related to an element and is related to an element then is also related to.

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## Redirects here:

0 law of thermodynamics, 0th Law of Thermodynamics, Status of the zeroth law of thermodynamics, Zeroeth law of thermodynamics, Zeroth Law Of Thermodynamics, Zeroth Law of Thermodynamics, Zeroth Law of thermodynamics.

## References

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