Three States of Matter are:
1. Solid State
Solids posses a definite shape and structure.
2. Liquid State
A Liquid will take the shape of the container which holds it.
3. Gaseous State
A Gas takes shape and volume of the container which holds it.
Definition of Matter: Matter is anything that occupies space and time.
Law of conservation of matter: The Law of conservation of matter states that, there is no change in total quantity of matter when conversion happens from one type to another. (Example for solid state to liquid state).