![]() ![]() Then making use of the definition of temperature in terms of entropy: Expanding the entropy expression for V f and V i with log combination rules leads toįor determining other functions, it is useful to expand the entropy expression using the logarithm of products to separate the U and V dependence. One of the things which can be determined directly from this equation is the change in entropy during an isothermal expansion where N and U are constant (implying Q=W). The entropy S of a monoatomic ideal gas can be expressed in a famous equation called the Sackur-Tetrode equation.
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