This experiment demonstrates the power of vacuum. Take two Sanitary Rubber Plungers used for cleaning drains. Place them mouth-to-mouth and press them to lock. Now try pulling them apart. It will be very difficult to separate them. This demonstrates the enormous power of vacuum.
http://www.arvindguptatoys.com/toys/pushplungers.html This work was supported by IUCAA and Tata Trust. This film was made by Ashok Rupner TATA Trust: Education is one of the key focus areas for Tata Trusts, aiming towards enabling a
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