A transparent rigid container is filled with 2 gallons of water. Initially the p

Question

A transparent rigid container is filled with 2 gallons of water. Initially the pressure is measured to be 10.2 psig, using a gage attached to the container. The local atmospheric pressure is 14.8 psia. It is observed that the liquid water in the container occupies two percent of the container volume. The water in the container is heated. Determine the reading on the pressure gage in psig when all the liquid has just turned to vapor (all saturated vapor). Show this process on a sketch of a T-v diagram.

Explanation / Answer

help: P1=25psia. T1:240 F, V1=.8 ft^3/Lb, X=4.8% Condition 2: V2=.8 ft^3/lb, x=100% because you are saturated vapor, Vg=V2=.8 ft^3/lb look on steam tables at Vg= .8 ft^3/lb to find P2 and T2

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