# Gases

1. Gases are made of millions of tiny particles called  ……………………………………..…

2. These particles are ……………………………………………….. at high speed

3. The gas exerts a pressure because the particles  ……………………………. with the

walls of the container.

4. When the temperature of the gas gets less the particles move ………………………………

5. When the temperature of the gas gets bigger the particles move ……………,,…………..…

6. If you compress some gas in a piston the pressure of the gas ………………………………

7. If you heat a gas in a sealed can (dangerous!) the pressure of the gas will ………………..

and eventually the can may …………………………….. This happens because the particles in

the gas are ……………………………………………………………………………………………..

8. The particles in a gas with a low density will move   …………………………….. than those

of a high density if both the gases are at the same temperature.

9. When you pump up a bicycle tyre the pressure inside the tyre gets bigger because

……………………………………………………………………………………………………………

……………………………………………………………………………………………………………

10. If all the gas particles are taken out of a sealed can the space left behind in the can is

called a …………………………………….