Air – The Invisible Treasure

📚 Key Concepts

🔹 What is Air?

Air is a mixture of gases that surrounds the Earth. It is invisible but essential for all life forms. We can feel air when it moves as wind.

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Composition of Air:

  • Nitrogen: 78%
  • Oxygen: 21%
  • Other gases (Argon, CO₂, etc.): 1%

🔹 Why is Air Important?

Essential Functions:

  1. Breathing – We need oxygen for survival
  2. Photosynthesis – Plants use CO₂ to make food
  3. Weather patterns – Air movement creates weather
  4. Energy generation – Windmills use air for electricity

Examples:

  • We cannot survive without oxygen for even a few minutes
  • Wind rotates windmill blades to generate electricity
  • Moving air helps in seed dispersal and pollination