Question

what are intermolecular force ? How are these related to the three state of matter

Answer 1

particles of matter are held together by the force of attraction that exist between them . This force is known as intermolecular force of attraction.

Answer 2

everything is made up of atoms ,or say, a group of atoms ( molecules)..these are bonded up together only by the intermolecular forces. hence, intermolecular forces mediate interactions between molecules , including force of attraction and repulsion

In solids, these are said to be the highest and thus provide a firm structure while in liquids, the intermolecular forces are not so powerful to hold the atoms as firm as in the case of solids ,and provide them some free space to move but in gaseous substancges, the intermolecular forces are lowest as compared to the solids and liquids, that's why the particles in a gas are free to move .