Molecules have random but constant motion, and the velocity at which they travel depends on the amount of energy transferred through the surrounding heat. This is why molecules in a heated environment (think boiling water) move much faster those in cold or frozen environments (such as ice). See also osmosis and diffusion (article below).
The differences between the states of matter is the intermolecular forces bindind their molecules.This force of attraction that bind the molecules is different in each of the state of matter.These molecules can only move when they gain kinetic energy.The kinetic energy is gained when heat is applied to the state of matter(solid,liquid and gas).The molecules in the solid have restriction to movements due to the strong forces of attraction that exist among the molecules but change to liquid as they gain kinetic energy which causes their movement.A process known as melting.
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