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( P + a / V² ) ( V - b ) = R T        is a simplified Van Der Wall 's fluid or gas equation  for one mole

a has dimensions  P V²  =  M L^-1 T^-2  L^6  = M L^5 T^-2
b has dimensions =  Volume = L³

a / b has dimensions of  P V    ie., =  energy or work done =  M L^2  T^-2