The three main states of matter are solids, liquids, and gases. Compare the three states with reference to the following characteristic of matter -
volume
A substance's volume is the amount of space it takes up.
Gases have no definite volume due to vast intermolecular distances and a negligible force of attraction between particles, whereas solids and liquids have a definite volume due to limited intermolecular gaps between particles. As a result, gas particles have complete freedom of movement.