Engineering Thermodynamics
When the expansion or compression takes place according to the law pvn = C, the process is known as

Isothermal process
Adiabatic process
Polytropic process
Hyperbolic process

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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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