Van der Waals equation adjustments

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Homework Statement



Why in the van der waals equation, is the pressure correction term added on to the measured pressure but the volume correction term subtracted from the measured volume?


Homework Equations



(p+n^2a/V^2)(V-nb)=nRT

The Attempt at a Solution



I thought that the pressure term is added on because some of the pressure is reduced by the role of the intermolecular forces near condensation point. But I thought that the ideal gas law tends to overestimate volumes too because as pressure gets higher, the particles will have less free volume(ie. ideal volume) to move around because their molecular volume is taking up significant room?
 

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