Observing the changes in sound in Sound – Class 8 Science Experiment

Chapter Name: Sound

Activity Name: Observing the changes in sound in Sound

Activity Description:

Observing the changes in sound in Sound - Class 8 Science Experiment

This experiment involves observing the changes in the sound produced by striking metal glass bowls or tumblers filled with water in decreasing order and with equal amounts of water.

Required Items:

  1. 4 or 5 metal glass bowls or tumblers
  2. Water
  3. Spoon

Step by Step Procedure:

  1. Take 4 or 5 metal glass bowls or tumblers.
  2. Fill them with water in decreasing order, with the first bowl having the most water and the last bowl having the least.
  3. Strike each bowl or tumbler gently with a spoon.
  4. Observe and listen to the sound produced.
  5. Refill the bowls or tumblers with equal amounts of water.
  6. Strike each bowl again with the spoon.
  7. Observe and listen to the sound produced.

Experiment Observations:

  1. When striking the bowls with different water levels, you will notice variations in the pitch and tone of the sound produced.
  2. The sound produced by the bowls with more water will be lower in pitch and deeper in tone, while the bowls with less water will produce a higher-pitched and lighter tone.
  3. When all bowls have equal amounts of water, the sound produced will be at a consistent pitch and tone.


  1. Handle the glass bowls or tumblers with care to avoid breakage.
  2. Use a gentle strike with the spoon to avoid any damage to the bowls and to produce a clear sound.

Lesson Learnt from Experiment:

This experiment demonstrates that the amount of water in the metal glass bowls or tumblers affects the pitch and tone of the sound produced. The variation in the sound is due to the different levels of water, which alters the vibrations and resonance of the bowls.

It shows that sounds are produced by vibrating bodies, such as the metal bowls, and the air passing through orifices in musical instruments plays a significant role in the sound production.

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