Engineering Thermodynamics
Zeroth law of thermodynamics

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

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Engineering Thermodynamics
A closed system is one in which

Mass does not cross boundaries of the system, though energy may do so
Both energy and mass cross the boundaries of the system
Mass crosses the boundary but not the energy
Neither mass nor energy crosses the boundaries of the system

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