As noted in Ex. 6.6, H lv is not independent of T; in fact, it becomes

As noted in Ex. 6.6, Δ H lv is not independent of T; in fact, it becomes zero at the critical point. Nor may saturated vapors in general be considered ideal gases. Why is it then that Eq. (6.89) provides a reasonable approximation to vapor-pressure behavior over the entire liquid range?

Exercises 6.6

A pure fluid, described by the canonical equation of state: G = F(T) + KP, where F(T) is a substance-specific function of temperature and K is a substance-specific constant. Determine for such a fluid expressions for V, S, H, U, C_P, and C_V. These results are consistent with those for an important model of liquid-phase behavior. What is the model?

Eq. (6.89)

Transcribed Image Text:

B In Psat = A - (6.89)