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Van der waal's equation

  1. Mar 26, 2012 #1
    In reality pressure of a gas is lower than what is expected and volume is larger than expected - as ideal gas equation neglected volume of gas molecules and forces between them. Van der waal corrected it but:-

    I need to know then why do we add the constant n^2a/V^2 in pressure and subtract nb in volume


    Shouldnt we subtract n^2a/V^2 from pressure as it is lower than what was expected

    similarly we should add nb in volume as it is more than what was expected

    Im a bit confused over van der waal's equation. Cannot understand it
     
  2. jcsd
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