Concept 1 of 8Foundation
Watch on YouTubeVideoAir — the invisible ocean
Earth is wrapped in a layer of gases called the atmosphere. We live at the bottom of this ocean of air.
Air is NOT a single gas — it's a mixture:
- ~78% Nitrogen (N₂)
- ~21% Oxygen (O₂)
- ~1% Argon, carbon dioxide, water vapour, dust, pollutants
Plants make oxygen (photosynthesis). Animals and burning use oxygen and release CO₂.
Example
Blow up a balloon — it's full of air (mostly nitrogen). Light a match inside? Flame uses up the ~21% oxygen.
💡 Tip:Nitrogen is plentiful but mostly inert. It's the OXYGEN in air that keeps us alive and fires burning.
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5 questions to check what you just read.
0 / 5
- Q1.Approx % of nitrogen in air:
- Q2.Approx % of oxygen in air:
- Q3.Which gas do we use to live?
- Q4.Air is:
- Q5.Plants release ___ into the air during photosynthesis: