what role does repulsive force play in compressibility property of states of matter???

Dear student,

Repulsive forces between the molecules assist expansion and attractive forces assist compression.

At a moderate pressure when the molecules of a gas are few molecular diameters apart, the attractive forces dominates over repulsive forces and hence can be said that the gas is more compressible than a perfect gas, but at high pressures, the average separation of molecules becomes very small and repulsive forces dominates over attractive ones, and thus the gas is less compressible than a perfect gas because the repulsive forces now drive the molecules apart and exert more pressure on each other and the walls of the container.

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