Question

Explain the physical significance of van der Waals parameters?

Answer 1

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The van der Waals equation is an equation of state for a fluid composed of particles that have a non-zero volume and a pairwise attractive inter-particle force.

The equation is (p + n^a/v^2) ( v - nb) = nRT


Physical significance of ‘a’: ‘a’ is a measure of the magnitude of intermolecular attractive forces between the particles

Physical significance of ‘b’:

‘b’ is the volume excluded by a mole of particles.

Answer 2

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