Question

(a) Please show that the heat capacity at constant volume and constant pressure for air are given by,Cv=macvmwherecvm= (1 + 0.92rv)cvdandCp=macpmwherecpm= (1 + 0.84rv)cpdIn the above equations, the mass of air isma=md+mv, wheremdandmvare the masses of dry air andvapor, respectively. The specific heats at constant volume and pressure for moist air (the combination ofdry air and vapor) arecvmandcpm, respectively. (b) The vapor pressure varies greatly in the atmosphere.At a temperature of 0oC, the vapor pressure can reach 611 Pa, while at 30oC, it can reach 4350 Pa. Howmuch do the specific heats at constant volume and pressure for moist air,cvmandcpm, vary at Earth’ssurface? Assume a surface pressure of 100,000 Pa.

Answer 1

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