San Francisco State University
ENGR 303: Engineering Thermodynamics
School of Engineering
Prof. Ed Cheng, Spring 2011
Homework 2 solutions
NOTE
: Solutions for HW problems that are based upon textbook problems reflect numerical values from
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Numerical values may differ for these problems when they appear on iLearn.
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solution presented below provides the appropriate solution
method
.
1.
The correct answer is (b).
Pressure and temperature are not independent when a substance is in a
saturated state.
I.e.
, there is a one-to-one relationship between saturation pressure and temperature.
2.
The correct answer is (a).
One way of understanding this is to consider a P-V diagram.
Slightly
increasing the pressure at constant temperature forces the state left and up relative to the saturated
liquid line (
i.e.
, into the compressed liquid region).

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