Engineering Thermodynamics
The variables which control the physical properties of a perfect gas are

Pressure exerted by the gas
All of these
Temperature of the gas
Volume occupied by the gas

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Engineering Thermodynamics
The specific heat at constant volume is

The amount of heat required to raise the temperature of 1 kg of water through one degree
The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant pressure
The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant volume
Any one of the above

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