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Gases

A gas burner
A gas burner
Credit: Wikimedia Commons. Click here for the license
Blowing bubbles under water
Blowing bubbles under water
Credit: Wikimedia Commons. Click here for the license

Gases spread out to fill the entire space they are in. If they are under water then they rise to the surface as bubbles because the water is much heavier.

The oxygen in the air you breathe is a gas. Some gasses are flammable and create heat when they burn. You can't usually see gases, but they are all around you.

How to identify:

It has no fixed shape or volume. It spreads out to fill any container it is in.

💡 Fun Facts

  • A gas will expand forever if it's not in a sealed container, just like the air in a balloon.
  • The particles in a gas are far apart and zoom around really fast in all directions.
  • You can feel a gas when the wind (which is moving air) blows against your face or when you feel the fizz from a fizzy drink.
  • If you blow through a straw into a glass of water, the bubbles you see are made from the gasses you are exhaling.