Air Composition
Oxygen, nitrogen, and carbon dioxide in air and why they matter.
3 topics • Notes • Practice • AI explanations available
1. Oxygen
21% of air; breathing and burning need oxygen.
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2. Nitrogen
78% of air; unreactive; uses in packaging and fertilisers.
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3. Carbon Dioxide
Exhaled gas; plants use in photosynthesis; limewater test.
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