Question

how do we know what is matter and what is not matter

Answer 1

Anything which has mass and occupies space is matter..

For the three states of matter...

1)Solid is not doubt a matter.
2) Fluids(Liquids and gases) can have less mass but they obviously occupies space.

Any error or doubts???
Comments

Answer 2

Explanation:

matter is anything that which occupies space and having mass