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(a) The specific heat capacity at constant volume (c v) is defined as the quantity of heat required to raise the temperature of 1 kg of the gas by 1 K if the volume of the gas remains constant.he molar heat capacity at constant volume (C V) is the quantity of heat required to raise the temperature of 1 mole of the gas by 1 K if the volume of the gas remains constant.
In vapor-pressure terms, the boiling point of water is the temperature at which the vapor pressure of the liquid is equal to that of the gas phase. Lower the surrounding pressure and you lower the boiling point, but the liquid will still not evaporate if you have 100% relative humidity.