Engineering Thermodynamics
Isochoric process is one in which

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

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Engineering Thermodynamics
An isolated system is one in which

Mass crosses the boundary but not the energy
Both energy and mass cross the boundaries of the system
Mass does not cross boundaries of the system, though energy may do so
Neither mass nor energy crosses the boundaries of the system

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