THERMODYNAMIC STATE VARIABLES AND EQUATION OF STATE

Thermal and mechanical equilibrium

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An equilibrium state of a gas is completely specified by the values of pressure, volume, temperature, and mass (and composition if there is a mixture of gases)

A gas comes to be in thermal and mechanical equilibrium with its surroundings as it attains uniform temperature and

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Equation of state

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The relation between the state variables is called the equation of state

The various state variables are each other.

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