Engineering Thermodynamics
Temperature of a gas is produced due to

Surface tension of molecules
Repulsion of molecules
Its heating value
Kinetic energy of molecules

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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
Internal energy, enthalpy and entropy during a process remain constant
Total internal energy of a system during a process remains constant

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