The transfer of heat energy by the movement of molecules within a liquid or gas is:

Question

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Convection is the transfer of heat energy by the movement of molecules within a liquid or gas. When a fluid is heated, the molecules near the source of heat gain energy and move apart from each other, becoming less dense. This hot fluid rises, and cooler fluid moves in to take its place, creating a cycle of circulation that transfers heat energy. This is commonly observed in phenomena such as ocean currents, atmospheric circulation, and the movement of air in a room when a heater is turned on.

The Transfer of Heat Energy by the Movement of Molecules