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What’s in the Chapter “Air Around Us”?
Here’s a quick overview of the key topics in this chapter:
- What is Air?
- Air is everywhere around us, but we can’t see it.
- It’s a mixture of gases that are essential for life.
- Components of Air:
- Nitrogen: The most abundant gas in the air (about 78%).
- Oxygen: Second most abundant (about 21%), needed for breathing.
- Carbon Dioxide: A small amount is present, crucial for plants.
- Water Vapor: Found in varying amounts, it causes humidity.
- Dust and Smoke: Tiny particles also mix with air.
- Importance of Air:
- Breathing: Essential for humans and animals to survive.
- Photosynthesis: Plants use carbon dioxide in the air to make food.
- Weather: Air movement (wind) influences weather patterns.
- Air is Everywhere:
- Even things that seem empty, like an inverted glass underwater, have air.
- Air fills spaces and takes up space itself.
- Uses of Air:
- Helps in burning (supports combustion).
- Necessary for flying objects like kites, airplanes, and balloons.
- Fun Facts About Air:
- Without air, sound cannot travel.
- The atmosphere is a protective layer of air around Earth.
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