3B30.30 - Bell in a Vacuum


Bell in Jar Demo
Bell in Jar Demo



Code: 3B30.30


Demo Title: Bell in a Vacuum


Subject: Wave Properties of Sound


Description:
By creating a vacuum in a jar the volume of the ringing bell fades to nothing. Demonstration of sounds dependency on a medium.


Procedure:

  • Turn on bell in jar so audience hears ringing.
  • Begin extracting air from the jar with vacuum pump and note how the volume of the bell decreases as the air is removed.
  • Once the vacuum is formed and air is almost completely removed from the jar there will be no sound escaping.

  • Video URL:


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