Van der Waals equation is a modification of the ideal gas law and takes into account both the volume of the gas molecules and the attractive forces acting between them.
Van der Waals equation is an equation relating the relationship between the pressure, volume, temperature, and amount of real gases.
For a real gas containing 'n' moles, the equation is written as;
( P + a n 2 V 2 ) ( V − n b ) = n R T.
Where, P, V, T, n are the pressure, volume, temperature and moles of the gas.
Ideal gas equation is equally valid for any gas, on the other hand the van der Waals equation contains a pair of constants (a and b) that change from gas to gas.
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