Engineering Thermodynamics
Gases have

Two values of specific heat
Only one value of specific heat
Under some conditions one value and sometimes two values of specific heat
No value of specific heat

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

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