You can very graphically see the formation and flow of convection currents. Fill hot water in the film can and drop a few crystals of potassium permanganate. Place its lid with a central hole. Place this film can in the big jar of cold water. Soon amazing convectional currents will rise up like a volcanic eruption.
http://www.arvindguptatoys.com/toys/convection.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 Tat
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