Engineering Thermodynamics
An adiabatic process is one in which

All of these
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

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Engineering Thermodynamics
According to First law of thermodynamics,

Total energy of a system remains constant
Work-done by a system is equal to the heat transferred by the system
Total internal energy of a system during a process remains constant
Internal energy, enthalpy and entropy during a process remain constant

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