Compare particle movement in liquids, gases, and solids.

The movement of particles in  gases is very random and disorderly because of the negligible forces between the gas particles. In liquids the forces holding the particles together are more closely packed therefore their movement is less disorderly,they can slide over one another. In solids the particles are tightly held together and so their movement is much less random,they can only vibrate at their lattice points.

In a solid the particles are barely moving at all, but they vibrate in place
in a liquid, the particles move on their own, sliding past each other
In a gas the particle mover freely at a very high speed