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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
Otherwise,

where,
and

By further differentiation, we obtain

and
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*

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Last Modified on: 01-May-2024

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