Fundamental Property Relations

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Fundamental thermodynamic property relations for a fluid of constant composition are as follows:

   → I    → II    → III    → IV

Criterion of exactness for a differential expression:

If , then the total differnential of F is defined as

   → V


where, and

By further differentiation, we obtain


Since the order of differentiation in mixed second derivatives is immaterial, these equations give

   → VI

Equation VI serves as a criterion of exactness, when F is a function of x & y


Last Modified on: 01-May-2024

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