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In van der Waal's equations (P+a/(V^(2))...

In van der Waal's equations `(P+a/(V^(2)))(V-b)=RT`, what are the dimensions of the constants a and b?

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In the equation ,
`(P + (a)/(V^(2))) ( V - b ) = RT [P] = [(a)/( V^(2))]`
or ` [a] = [PV^(2)] = [(MLT^(-2))/(L^(2)) L^(6)] = [ML^(5) T^(-2)]`
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