Thermal
In aviation, thermal refers to a rising column of warm air that can be used by glider pilots to gain altitude. Thermals are created by the sun heating the ground, which in turn heats the air above it. As the warm air rises, it cools and forms clouds. Glider pilots can use these thermals to gain altitude without the use of an engine. By circling within the thermal, the glider can gain altitude and travel long distances. Thermals can be difficult to locate and predict, but experienced pilots can use visual cues such as cumulus clouds and the behavior of birds to find them.
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