What Are Convection Currents?
7. Convection in Cooking
One of the simplest illustrations of convection currents is when boiling water. It is more so evident when you throw in small items that can make clear the flow of water, like peas.
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As the water at the bottom of the pot is heated, it gains more energy and you can see the water particles begin to move faster. Once it gets to a good boil, you can see how the peas keep moving upward and back down. This is driven by the hotter and less dense water molecules at the bottom of the pot that move upward, become cool through evaporation, then sink. Some of this energy will dissipate when it reaches the surface in the form of steam.
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