Product Description
This is a 3-foot-long hollow glass tube that is bent into a square shape with a funnel shaped opening on one side. The tube is filled with water and a pinch of potassium permanganate or a couple of drops of food coloring is added to the opening. The tube is then heated in the corner. As the heat is transferred from the glass to the water, the water starts to expand and rise. This pushes the dye around the tube, demonstrating the nature of a convection current. Great demo and very good visual. Everyone loves the magenta color of the potassium permanganate.
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