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## Sackur–Tetrode equationThe ## Additional recommended knowledgeThe Sackur–Tetrode equation is named for Hugo Martin Tetrode (1895–1931) and Otto Sackur (1880–1914), who developed it independently as a solution of Boltzmann's gas statistics and entropy equations, at about the same time in 1912. The Sackur–Tetrode equation is written: where The Sackur–Tetrode equation can also be conveniently expressed in terms of the
thermal wavelength Λ. Using the classical ideal gas relationship Note that the assumption was made that the gas is in the classical regime, and is described by Maxwell–Boltzmann statistics (with "correct counting"). From the definition of the thermal wavelength, this means the Sackur–Tetrode equation is only valid for and in fact, the entropy predicted by the Sackur–Tetrode equation approaches negative infinity as the temperature approaches zero. ## The Sackur–Tetrode constantThe (Note: sometimes a pressure of 100 kPa is used, which yields a value of −1.15169321.) Categories: Thermodynamic entropy | Gases |

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Sackur–Tetrode_equation". A list of authors is available in Wikipedia. |