Engineering Thermodynamics
Isochoric process is one in which

Very little mechanical work is done by the system
All parameters remain constant
Free expansion takes place
No mechanical work is done by the system

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Engineering Thermodynamics
According to Avogadro's Hypothesis

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

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