U(T,P) for Real Substances

Real Substances

Increasing T increases molecular vibrations, rotation and translation
Therefore, U increases as well.
Increasing P decreases U slightly at most values of T and P.
This phenomenon is due to complex molecular interactions.
U = U(T, P)
U as a Function of T at Constant P
Internal energy is a strong function of temperature.
U increases rapidly with temperature.
U as a Function of P at Constant T
Internal energy is a weak function of pressure at most T and P.
U increases rapidly with temperature.
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Ch 3, Lesson A, Page 2 - U(T,P) for Real Substances