Engineering Thermodynamics
Zeroth law of thermodynamics

Deals with conversion of mass and energy
Deals with heat engines
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

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Engineering Thermodynamics
According to Avogadro's Hypothesis

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

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