movement caused by the rising of less dense, hotter materials and the concurrent sinking of more dense, cooler materials.
The process in which a hot liquid moves away from the heat source, since hot liquid is lighter than cold liquid. The cold liquid far from the heat source moves to it since it's heavier than hot liquid. This is a continous cycle, as long as a heat source exsists. (See : PLATE TECTONICS)
Rising or sinking air currents that stir the atmosphere and transport heat from one area to another. Convection currents also occur in water; see spring overturn.
currents within a medium caused by a difference in temperature.
Warm air rising from a reflecting telescope's primary mirror, made turbulent by the open main tube.
currents in air and water that are induced by temperature differential
the currents caused by hot air or fluid rising and falling. Hot air or fluid expands and is therefore less dense than its cooler surroundings, thus it rises; as it cools it contracts, becomes more dense and sinks down creating something of a rolling motion. These motions are thought to be party of the dynamic geologic processes that drive the movement of crustal plates. See Plate Tectonics