The specific volume of air is expressed as the volume of: a. 1 kg of air at 101.325 kPa in cm3 b. 0.833 kg of air at standard pressure and temperature in m3 c. 1 kg of air at 101.325 kPa and 21 degrees Celsius in m3 d. 1 g of air occupied at any temperature and pressure e. 1 kg of air, regardless of temperature and pressure