Pressure is 2/3 of that at sea level.
The Clapeyron equation, where is the change in volume per unit mass;

Latent heat of transition for water is 40.72kJ/mole

Boiling point, assuming that we may treat the steam/air as an ideal gas.

Let the change in volume per unit mass be attributable to the steam alone, as the change in volume of water is negligable in comparison. Then,

which is variable seperable as

Integration of bothe sides gives

solving for the final temperature gives

which is about

Two phase substance.

1. no difference in specific volume of the two phases
2. no difference in specific entropy of the two phases
3. the specific heat and the volume expansion coefficient differ for the two phases

(a) Find dP(T)/dT as a function of T.
(b)describe the form of the P-V curve in the transition region, and its difference from ordinary gas-liquid phase transition.