Where do we find air? in Air, Winds And Cyclones – Class 7 Science Experiment

Chapter Name: Air, Winds And Cyclones

Activity Name: Where do we find air? in Air, Winds And Cyclones

Activity Description:

Where do we find air? in Air, Winds And Cyclones - Class 7 Science Experiment

This experiment demonstrates the concept of air pressure. By immersing a glass with crumpled paper at the bottom into a bucket of water, we observe the effects of air pressure on the trapped air inside the glass.

Required Items:

  1. Bucket filled with water
  2. Transparent glass
  3. Paper (crumpled into a ball)

Step by Step Procedure:

  1. Crumple a piece of paper into a ball.
  2. Fill a bucket with water.
  3. Take the transparent glass and push the crumpled paper to the bottom of the glass.
  4. Invert the glass (upside down) and carefully immerse it into the bucket of water while keeping the glass straight.
  5. Press the glass gently, ensuring it is completely submerged in the water.
  6. Carefully take out the glass from the water and observe what happens to the paper inside.

Experiment Observations:

  • The paper inside the glass does not get wet despite being immersed in water.
  • The air inside the glass creates a barrier, preventing water from entering and wetting the paper.

Precautions:

  1. Be cautious while handling the glass to avoid any breakage or injury.
  2. Ensure the glass is clean and transparent to make observations easier.

Lesson Learnt from Experiment:

This experiment illustrates the concept of air pressure. When the glass is immersed in water, the air trapped inside creates pressure, which prevents water from entering the glass and getting the paper wet. It highlights how air is present all around us and exerts pressure on objects.

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