AIR AND WEATHER ACTIVITIES

THE PROPERTIES OF AIR

• Air is invisible. It has no colour or smell. It has no shape or volume.
• Air has weight.
• Air occupies space.Air does not have its own shape.

THE IMPORTANCE OF AIR

People and animals need air to breathe.
Plants need air during photosynthesis.
Air is also needed for:

• Hearing. Sound travels through air. We cannot hear sound without air.
• Flying. Birds, butterflies and aeroplanes cannot fly without air.
• Burning. Fire needs oxygen from the air in order to burn.

THE COMPOSITION OF AIR

Air is the mixture of gases that surrounds the Earth. 

The main gases in air are:

• Nitrogen: the most abundant gas.
• Oxygen: the second most abundant gas. Plants produce oxygen. All living things need oxygen to breathe.
• Carbon dioxide: a very small part of air. Living things produce carbon dioxide when they breathe out. It is also produced by cars and factories.

AIR AND WEATHER

Air.

Air moves and occupies space.

Air is a mixture of gases. 

One of these gases is oxygen.

Weather.

Weather can be hot or cold, sunny or cloudy, dry or rainy. 

Air can be calm or windy.

Weather changes with each season: spring, summer, autumn, winter.