Communication
Install
Faster access than browser!

# Zeroth law of thermodynamics

The zeroth law of thermodynamics states that if two thermodynamic systems are each in thermal equilibrium with a third, then they are in thermal equilibrium with each other. [1]

## 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.

## Binary relation

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

## Constantin Carathéodory

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

## 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.

## Edward A. Guggenheim

Edward Armand Guggenheim FRS (11 August 1901 in Manchester – 9 August 1970) was an English thermodynamicist and professor of chemistry at the University of Reading.

## Equivalence relation

In mathematics, an equivalence relation is the relation that holds between two elements if and only if they are members of the same cell within a set that has been partitioned into cells such that every element of the set is a member of one and only one cell of the partition.

## Euclidean relation

In mathematics, Euclidean relations are a class of binary relations that satisfy a weakened form of transitivity that formalizes Euclid's "Common Notion 1" in The Elements: things which equal the same thing also equal one another.

## James Clerk Maxwell

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

## 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.

## Laws of thermodynamics

The four laws of thermodynamics define fundamental physical quantities (temperature, energy, and entropy) that characterize thermodynamic systems.

## Max Planck

Max Karl Ernst Ludwig Planck, FRS (April 23, 1858 &ndash; October 4, 1947) was a German theoretical physicist who originated quantum theory, which won him the Nobel Prize in Physics in 1918.

## 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.

## Mole (unit)

The mole is a unit of measurement for amount of substance.

## Ralph H. Fowler

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

## Real number

In mathematics, a real number is a value that represents a quantity along a continuous line.

## Reflexive relation

In mathematics, a reflexive relation is a binary relation on a set for which every element is related to itself.

## Second law of thermodynamics

The second law of thermodynamics states that in every natural thermodynamic process the sum of the entropies of all participating bodies is increased.

## Temperature measurement

Temperature measurement describes the process of measuring a current local temperature for immediate or later evaluation.

## Thermal equilibrium

Two physical systems are in thermal equilibrium if no heat flows between them when they are connected by a path permeable to heat.

## Thermodynamic system

A thermodynamic system is the content of a macroscopic volume in space, along with its walls and surroundings; it undergoes thermodynamic processes according to the principles of thermodynamics.

## Thermodynamic temperature

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

## Thermometer

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

## Transitive relation

In mathematics, a binary relation R over a set X is transitive if whenever an element a is related to an element b, and b is in turn related to an element c, then a is also related to c. Transitivity is a key property of both partial order relations and equivalence relations.

## References

Hey! We are on Facebook now! »