Engineering Thermodynamics
Zeroth law of thermodynamics

Deals with reversibility and irreversibility of process
States that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other
Deals with heat engines
Deals with conversion of mass and energy

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Engineering Thermodynamics
According to First law of thermodynamics,

Internal energy, enthalpy and entropy during a process remain constant
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

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