6.- Air

LISTEN AND READ

Air is a gas. Like all gases, air does not have its own shape. It takes the shape of the container it is in. Air occupies the greatest possible space. And air has weight, hot air weighs less than cold air.

There are different gases in air. The main gases are nitrogen and oxygen. There is more nitrogen than oxygen in the air. However, oxygen is very important. Living things need oxygen to breathe.