• Walk or cycle to school instead of driving this is because cars contribute 22% of CO2 emissions in Ireland
• Use public transport instead of cars
• Turn your heating down. Reducing your thermostat by 1C can cut your energy use and your home heating bill by 10%
• Insulate your hot water tank, attic and walls to reduce heat loss
• Choose energy-efficient appliances

Gases are identified as materials that

• have no definite shape
• have no definite volume
• can be easily compressed
• can flow

In a gas the particles move in all directions and the bounce off one another, causing the particles to spread out further and further.

If the gas is held in a container the particles will bounce off the walls of the container as well as each other.

Water vapour is an example of a gas. Water vapour usually is invisible.