RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY
Convection current. A small crystal of potassium permanganate at lower left is heated, dissolves, and imparts purple colour which reveals the convection current set up by the heat. As the water at the bottom of the beaker heats up, its density decreases. This causes it rise upward. As it moves upwards and further away from the heat source, it begins to cool. As it cools, the density decreases which causes it to sink back down again. In this way a current is created that circulates the water around the beaker.
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