Introduction to State of Matter

There are three states of matter namely solid, liquid and gas. Depending upon the temperature and pressure, a substance may exist in any one of the three states. Thus, water exists as solid (ice), liquid (water) or gaseous (steam) depending upon the temperature and pressure. The three states of matter can be defined as follows:-

A substance is said to be Solid if its melting point is above room temperature under atmosphere pressure.

A substance is said to be Liquid if its melting point is below room temperature under atmosphere pressure.

A substance is said to be Gas if its boiling point is below room temperature under atmosphere pressure.