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At low pressure the van der Waals' equat...

At low pressure the van der Waals' equation is reduced to `[P +(a)/(V^(2)]]V =RT` The compressibility factor can be given as .

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`PV+(a0V) =RT`
`:. PV =RT -(a)/(V),`
`Z = (PV)/(RT) [1-(a)/(RTV)]` .
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