Air at 50% relative humidity is cooled at constant pressure of 1 atm from 90 °C to 25 °C.
1) Estimate the dew point and degrees of superheat of the air at 90 °C.
2) How many moles of water condense per cubic meter of feed gas?
3) Suppose a sample of the 90 °C air is put in a closed variable-volume chamber containing a mirror, and the pressure is raised at constant temperature until a mist forms on the mirror. At what pressure would the mist form? Assume ideal gas behavior.