Solids, Liquids and Gases
Matter is the amount of stuff in an object. The physical appearance of matter in five different states is referred as 'States of matter'. Among the five states, solid, liquid and gas are considered as the primary states due to their existence at room temperature.
In a solid, matter maintains a fixed volume and shape. In liquid state, matter has fixed volume but adapts the shape of its container. The inter-molecular attractions keep the molecules in proximity, but do not keep them in fixed relationship. In the gaseous state, matter expands to occupy the available volume. In this state, the inter–molecular attractions among the molecules are relatively less that effects their motion.Change in temperature and pressure favors the inter conversion of states, as observed in the water cycle.
Plasma and Bose–Einstein Condensate are the fourth and fifth states of matter that occur at extremely high and super low temperatures respectively.