Engineering Thermodynamics
Isochoric process is one in which

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

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Engineering Thermodynamics
An open system is one in which

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

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