Vacuum Hood Suction Disc Bell in Vacuum Laboratory Jar Sound Physics for Sound Propagation Experiment and Low-Pressure Plastic Cover Boiling Test

• The max height: 270mm
• The max diameter: 195mm
• Main material: glass and platics
• Notice: you need a vacuum pump to do the experiment
• 1. Sound propagation experiment 
  The Bell on the bell with a bell above the sound of the bell, bells can still hear a clear electric bell, and then extract the air bell, electric bells will gradually weaken until the sound can not hear, close the exhaust valve , So that students observe, bell bell hammer is still kept ringing bell, but can not hear the sound. 
  2. Low-pressure boiling test

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