Where does diffusion take place faster?

In gases, diffusion is faster. This is due to the fact that the forces of intermolecular interaction are insignificant. Molecules move freely, chaotically, continuously throughout the volume. It is not difficult for molecules of another gas to penetrate into the intermolecular space of the gas.
In liquids and solids, the forces of intermolecular interaction are significant, the molecules cannot move freely throughout the volume of the substance. It is more difficult for molecules of another substance to penetrate into the intermolecular space.



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