Gases have three main properties:

  1. It does not have a definite shape.
  2. It does not have a definite mass.
  3. It does not have a definite volume.

Air
is a
gas

This means that a gas does not always take up the same amount of space, nor does it weigh the same all the time. Like liquids, gases take the shape of their containers. However, they will fill the space they are given. That is why they don't always take up the same amount of space!!

The sun (made up of many gases), smoke from fire, and water vapor in clouds are all gases too. Can you think of more?

SOLIDS

LIQUIDS

GASES

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Last updated January 29, 2000