Air in Balloon in Air, Winds And Cyclones – Class 7 Science Experiment

Chapter Name: Air, Winds And Cyclones

Activity Name: Air in Balloon in Air, Winds And Cyclones

Activity Description:

The experiment involves using a balloon to observe the behavior of air under pressure and how it responds to changes in pressure. By blowing air into the balloon, it expands, and its walls become harder to press due to the internal air pressure.

When the mouth of the balloon is slightly opened, the air inside rushes out, allowing students to control the flow of air. The experiment aims to illustrate how air moves from high-pressure areas to low-pressure areas, creating winds.

Required Items:

  1. Balloon

Step by Step Procedure:

  1. Take a balloon and blow air into it.
  2. Observe how the balloon expands and becomes harder to press as it fills up with air.
  3. Open the mouth of the balloon slightly.
  4. Observe what happens as the air rushes out from the balloon.
  5. Experiment by opening the mouth more or less to control the flow of air.

Experiment Observations:

  • The balloon expands and becomes harder to press as air is blown into it.
  • When the mouth of the balloon is opened, air rushes out from the balloon, demonstrating the movement of air from high-pressure to low-pressure areas.


  1. Be careful not to overinflate the balloon, as it may burst.
  2. Be cautious while releasing the air from the balloon, as it can create a sudden burst of wind.

Lesson Learnt from Experiment:

The experiment helps students understand the concept of air pressure and its role in wind formation. Air moves from areas of higher pressure to areas of lower pressure, resulting in wind.

The greater the difference in pressure, the faster the air movement. The activity also raises questions about how pressure differences and winds occur naturally, and whether temperature differences play a role in their formation.

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