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Equation of state of gas is an equation that links the important variable that defines the state of the gaseous system.
The equation must accurately integrate the variable so that it could be used to determine the state of the system through measurement of some of the variables.
An example of the EoS is the perfect gas equation of state:
PV=nRT
This equation is useful for gas at low pressure because it assume that the gas molecules does not occupies space and do not interact with each other.
Different equation of state has been proposed to capture the system more accurately.
Another rexample is the van der Waal equation of state:
P = nRT/(V-bn) -a(n2/V)
where a and b are van der Waals constant with a representing the volume occupy by the molecules and a as representing the intermolecular interaction among the molecules.
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