Engineering Thermodynamics
If a gas vapour is allowed to expand through a very minute aperture, then such a process is known as

Free expansion
Throttling
Hyperbolic expansion
Adiabatic expansion

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Engineering Thermodynamics
A closed system is one in which

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

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