States of matter
Water is a substance that can be a solid, liquid or gas. All of those states are matter. The solid is Ice (Frozen Water.) The liquid is water (The water we drink) The gas is water vapour (The steam that comes out of a boiling pot.)
The particles in these substances are all different. the particles in the liquid (water) are separated and can move anywhere. With the solid (ice) particles are thick and stuck together in an organised group. With the gas (water vapour) there are not many particles and they have a large space between them and are not in an organised group.
The End
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