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

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

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Engineering Thermodynamics
According to Avogadro's Hypothesis

The molecular weights of all the perfect gases occupy the same volume under same conditions of pressure and temperature
Product of the gas constant and the molecular weight of an ideal gas is constant
The sum of partial pressure of mixture of two gases is sum of the two
Gases have two values of specific heat

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