Engineering Thermodynamics
Isochoric process is one in which

All parameters remain constant
Very little mechanical work is done by the system
Free expansion takes place
No mechanical work is done by the system

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Engineering Thermodynamics
The specific heat at constant volume is

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 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
Any one of the above

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