Unit 4: Air

Can you see the air? No, because it is...

• odourless

• colourless

• tasteless

Can you smell the air? No, because it is...

• odourless

• colourless

• tasteless

Can you taste the air? No, beacause it is ...

• odourless

• colourless

• tasteless

Air is mostly ...

• water

• nitrogen

• gas

Air is all around us, but we can’t ....

• see it.

• feel it.

• hear it.

We can feel the air when it ...

• touches us.

• moves around us.

• hit us.

What´s air?

• It’s a mixture of different gases and dust particles that surround the Earth.

• It’s a mixture of different gases and water particles that surround the Earth.

• It’s a mixture of different carbon dioxide and dust particles that surround the Earth.

Air is made up of ...

• 78 % Oxygen, 21 % Nitrogen and 1% Other stuff

• 78 % Carbon dioxide, 21 % Oxygen and 1% Other stuff

• 78 % Nitrogen, 21 % Oxygen and 1% Other stuff

Air also has small amounts of lots of other gases, such as:

• carbon dioxide, neon and Nitrogen.

• carbon dioxide, neon and hydrogen.

• carbon dioxide, neon and oxygen.

Why do we need air?

• We need air to eat.

• We need air to breathe.

• We need air to hear.