Gases of the air
- 1. Gases around us
Are made of particles Consist of…….
Nitrogen
These are invisible Oxygen
Water Vapour
Argon
Carbon Dioxide
Helium and Hydrogen
In the upper atmosphere
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- 2. The particles in a gas are…
separated by large spaces
free to move
THIS MEANS THAT GASES CAN……
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- 4. Each tiny particle in a gas has a mass. If you add
these up …………….…
A balloon contains 2g of air
1 m3 contains about 1 kg of air
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- 5. The mass of air pushing
down on every m2 of the
earth’s surface is huge…
About 10 tonnes / m2
Or 10 elephants
standing on each other
SO WHY DOESN’T THE
TABLE BREAK?
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- 6. Because air is a fluid.
Pressure acts in all
directions at once
The pressure pushing DOWN
Is balanced by
The pressure pushing UP
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- 7. The air in the atmosphere is made from 3 Gases
NITROGEN 78%
OXYGEN 21%
ARGON 0.9 %
Carbon Dioxide 0.03%
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- 9. OXYGEN 21%
Burns fuels…
Carbohydrates Hydrocarbons
To Produce ENERGY
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- 11. It is used …..
In fire extinguishers
In Fizzy drinks
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