This is one of the apparatus to be used in scientific laboratories to demonstrate that sound needs a medium to travel.
Turn on the bell placed in this vacuumed jar.
Now during this experiment the sound that will be produced in this jar is not audible to our ears, as the sound waves can’t travel in a vacuum state and they need a material medium for its propagation.
It can also place on pump plates to perform experiments with diameter at least 15cm.
Excellent demonstration tool for science classrooms.
Size of Bell Jar : 9″x6
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The cloth rubbing wool is used to perform the static electricity experiment.
A cloth rubbing wool is used for rubbing against different materials, such as glass, plastic, balloon, wax.
Wool cloth is used to demonstrate experiments for balloon and wool cloth.
When rubbing a balloon with a wool cloth, the balloon captures electrons from the wool, leaving the balloon with a negative charge and the wool with a positive charge.
If both balloons are rubbed with wool, they will both have same charge (negative) and therefore will repel each other. When you spray water near the balloons.
The water droplets carry the charges away from the balloons, leaving them uncharged. As the balloons become neutral, they will fall back together.
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