Engineering Thermodynamics
Compressed air coming out from a punctured football

Becomes hotter
May become hotter or cooler depending upon the humidity of the surrounding air
Remains at the same temperature
Becomes cooler

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Engineering Thermodynamics
An isolated 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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