Engineering Thermodynamics
In an isothermal process, the internal energy of gas molecules

Increases
May increase/decrease depending on the properties of gas
Decreases
Remain constant

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Engineering Thermodynamics
An open system is one in which

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

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