Observing air pressure in Floating bodies – Class 9 Science Experiment

Chapter Name: Floating bodies

Activity Name: Observing air pressure in Floating bodies

Activity Description:

Observing air pressure in Floating bodies - Class 9 Science Experiment

The experiment aims to observe the effect of air pressure on water when a glass tumbler with cotton at the bottom is immersed in water upside down.

The cotton prevents water from entering the tumbler due to the force of air present inside, creating pressure on the water’s surface.

Required Items:

  1. Glass tumbler
  2. Cotton
  3. Water

Step by Step Procedure:

  1. Take a glass tumbler and place some cotton at the bottom.
  2. Fill a container with water.
  3. Invert the tumbler and immerse it in the water, ensuring that the bottom of the tumbler is submerged.

Experiment Observations:

  1. Upon taking out the tumbler from water, the cotton attached to its bottom remains dry.
  2. This phenomenon occurs because of the force of air present in the tumbler, which applies pressure on the water’s surface, preventing it from entering the tumbler.


  1. Ensure the glass tumbler is clean and free from any cracks or damage.
  2. Use sufficient cotton at the bottom of the tumbler to create an effective seal.
  3. Carefully invert the tumbler to avoid splashing water.

Lesson Learnt from Experiment:

This experiment demonstrates the concept of air pressure and its ability to exert force on the surface of water, counteracting the force of gravity and preventing water from entering the tumbler. It provides a practical example of how air pressure can affect objects in certain conditions.

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