Engineering Thermodynamics
The variables which control the physical properties of a perfect gas are

Volume occupied by the gas
Temperature of the gas
All of these
Pressure exerted by the gas

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Engineering Thermodynamics
An open system is one in which

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

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