Thermal

• A thermal column is a column of rising warm air in the lower altitudes of the Earth's atmosphere, and are informally referred to as thermals. Thermals are created by the uneven heating of the Earth's surface from solar radiation. The movement of air or other fluid is an example of convection.

The size and strength of thermals are influenced greatly by the properties of the lower atmosphere. The most important factor is the amount of atmospheric stability. Generally, when the atmosphere is less stable thermal formation is more likely.

Thermals are often indicated by the presence of visible cumulus clouds. The rising air in a thermal cools as it ascends, until the water vapor in the air begins to condense into visible droplets.

• Thermal also refers to occurrence of heat and things involving heat, or the release there of. A thermal reaction refers to a chemical reaction that releases heat.

• Thermal clothing is clothing that would be worn in extreme cold to conserve body heat.

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