Engineering Thermodynamics
If a system after undergoing a series of processes, returns to the initial state then

Process is thermodynamically in equilibrium
Process is executed in closed system cycle
Sum of heat and work transfer will be zero
Its entropy will change due to irreversibility

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Engineering Thermodynamics
According to Avogadro's law, for a given pressure and temperature, each molecule of a gas

Occupies volume inversely proportional to its specific weight
Occupies volume inversely proportional to its molecular weight
Occupies same volume
Occupies volume proportional to its specific weight

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