Summary

• Matter can exist in three different states: solid, liquid and gas.

• Solids, liquids and gases have unique properties that characterise them.

• The properties of solids are:

• ▸ Fixed shape.

• ▸ Fixed volume.

• ▸ Not easily compressed.

• ▸ High or very high density.

• The properties of liquids are:

• ▸ Variable shape.

• ▸ Fixed volume.

• ▸ Not easily compressed.

• ▸ High density.

• The properties of gases are:

• ▸ Variable shape.

• ▸ Variable volume.

• ▸ Easily compressed.

• ▸ Very low density.

• Water exists naturally on Earth in all three states – as ice, liquid water and water vapour.

(Image: Mariamichelle, Pixabay)