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In Vander Wall's equation (P +(a)/(V^2))...

In Vander Wall's equation `(P +(a)/(V^2))(V - b) = RT` What are the dimensions of a and b ? Here, P is pressure, V is volume, T is temperature and R is gas constant.

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Since dimensionally similar quantities can only be added
`therefore [P]=[(a)/(V^(2))]implies[a]=[PV^(2)]=[M^(1)L^(5)T^(-2)]`
`[b]=[V]=[L^(3)]`
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