Fig. 3. a Pressure-volume curves of moist air during adiabatic expansion, starting from Pi=2, 4, and 6 bars, and initially in equilibrium with water at Ti=10, 50, and 90 °C + . The solid lines are isotherms pV=constant and dry adiabats pV =constant . b Moist adiabats are approximated by a polytropic process of the form pV =constant dotted lines in a , the exponent of which is a function of the initial relative humidity.
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