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Bridgman's Thermodynamic EquationsIn Thermodynamics, Bridgman's Thermodynamic equations is actually a method of generating a large number of thermodynamic identities involving a number of thermodynamic quantities. Some of the most common thermodynamic quantites are: Many thermodynamic equations are expressed in terms of partial derivatives. For example, the expression for the specific heat at constant volume is: -
which is the partial derivative of the internal energy with respect to temperature while holding volume constant. We may write this equation as: -
This method of rewriting the partial derivative was described by Bridgman (and also Lewis &; Randall), and allows the use of the following collection of expressions to express many thermodynamic equations. For example in the equations below we have: -
and -
Dividing, we recover the proper expression for CP. The following summary restates various partials in terms of S, T, P, and the following three derivatives which are easily measured experimentally. -
\left(\frac{\partial V}{\partial T}\right)_P,~~~ \left(\frac{\partial V}{\partial P}\right)_T,~~~ \left(\frac{\partial H}{\partial T}\right)_P (=C_P) Bridgman's thermodynamic equations -
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References - Bridgman, P.W., Phys. Rev., 3, 273 (1914).
- Lewis, G.N., and Randall, M., "Thermodynamics", 2nd Edition, McGraw-Hill Book Company, New York, 1961.
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