At state 1, a piston–cylinder device contains 0.004m³ of moist air initially at 20° C and 0.10135MPa with a 70% relative humidity. The volume is then decreased to 0.002m³ at state 2 as the piston is pushed inward in a reversible isothermal process.

A. Complete the following table:

B. Does the total internal energy of the contents of the cylinder increase, decrease, or remain constant during this process? Explain.

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Property Relative humidity Humidity ratio Dew-point temperature (°C) Mass of dry air (g) Mass of water vapor (g) Mass of liquid water (g) State 1 State 2