Prévost's theorem

The Prévostsche sentence is a concept of physics and the thermodynamics used.

Pierre Prevost recognized in 1809 that the heat exchange between two different hot bodies A and B in a closed system proceeds as follows: the warmer body A irradiated to the colder body B a certain amount of radiation energy from that of B is absorbed is. Simultaneously receiving bodies A and B of the body a smaller amount . Since A emits more energy than it receives, it slowly cools down, while conversely B warms up until both are at the same temperature . In this equilibrium state , the exchanged are heat quantities and the same. ${\displaystyle S_{A}}$ ${\displaystyle S_{B}}$ ${\displaystyle S_{A}}$ ${\displaystyle S_{B}}$

The designation Prévost's theorem or Prévost's theory of heat exchange is only of historical significance, as the relationship described today forms the natural basis of radiation laws.

See also

• Kirchhoff's law of radiation

Individual evidence

1. ^ JC Maxwell: Theory of Heat . Longmans, Green and Co, London 1871, pp. 221-222 ( digitized version ).
2. ^ Pierre Prévost, Balfour Stewart, Gustav Kirchhoff, Robert Bunsen: The Laws of Radiation and Absorption: Memoirs by Prévost, Stewart, Kirchhoff, Bunsen . American Book Company, 1901 ( digitized ).