Class 4 (SSC) • EVS भाग 1 - विज्ञान (परिसर अभ्यास)Chapter 9: Air⭐ Topic 1
Air
Air is a mixture of gases essential for life, and understanding its composition and properties helps us appreciate why clean air matters.
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Air is mainly made of nitrogen (about 78%) and oxygen (about 21%), with small amounts of carbon dioxide and other gases.
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- Air: ~78% nitrogen, ~21% oxygen.
- Small amounts of CO2, other gases too.
- Living things breathe oxygen from air.
- Plants use CO2 for photosynthesis.
- Air has weight, takes up space.
- Moving air is wind.
- Air pollution comes from smoke, dust, vehicles.
- Clean air is important for health.
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airssc std 4maharashtra board