The dimensional formula of the constant a in van der waals equation
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Van Der waals equation, where a is constant pressure and b is additional volume is given by :{(p+a.n^2/)/V^2}(V-nb)
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Since the van der Waals equation is derived from the ideal gas equation, the empirical constants a and b need to have dimensions so that the units work out. The ideal gas constant R has dimensions of pressure⋅volumemoles⋅temperature since R=pVnT for an ideal gas. This is one of the definitions of R.
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