explain the physical significance of van der waals parameter?
The van der Waals’ equation can be written as follows:
Significance of van der Waals’ parameter ‘a’:
It is the measure of the magnitude of attractive forces between the molecules of a gas.
Unit: atm L2 mol−2 or bar L2 mol−2
Larger the value of ‘a’, larger will be the intermolecular force of attraction.
It is independent of pressure and temperature.
Significance of van der Waals’ parameter ‘b’:
It is the measure of the effective size of gas molecules.
Unit: L mol−1
Hope, this answers your question.