## Evaluating Entropy (The Tds relations)

That is "**T****e****d****iou****s**",
but without the vowels, of course! Recall from consideration of the
**Clausius
Inequality** that we defined entropy as
follows:

### Tables of 2-phase fluid (Steam, R134a)

Notice that all the properties on the right hand side
of this equation T, P, v, u are measurable properties given in the
tables, thus this differential equation can be solved numerically,
leading to the table values of entropy s.

### Liquid (or solid - incompressible)

### Ideal Gas

Engineering Thermodynamics by Israel
Urieli is licensed under a Creative
Commons Attribution-Noncommercial-Share Alike 3.0 United States
License