Engineering Thermodynamics
An adiabatic process is one in which

The change in internal energy is equal to the mechanical work done
No heat enters or leaves the gas
The temperature of the gas changes
All of these

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Engineering Thermodynamics
Extensive property of a system is one whose value

Is dependent on the path followed and not on the state
Is not dependent on the path followed but on the state
Depends on the mass of the system like volume
Does not depend on the mass of the system, like temperature, pressure, etc.

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