Engineering Thermodynamics
Gases have

No value of specific heat
Only one value of specific heat
Under some conditions one value and sometimes two values of specific heat
Two values of specific heat

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Engineering Thermodynamics
A closed 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 does not cross boundaries of the system, though energy may do so
Mass crosses the boundary but not the energy

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