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## Homework Statement

(P+ an^2/V^2)(V-nb) = nRT

I'm having some problems in understanding the above equation.

firstly, PV=nRT holds for ideal P and V , so after correction we are writing ideal P and V in terms of measured P and V right?

secondly V-nb is the actual volume not the ideal one. isnt it? if yes what is it doing in the above equation?