rising current of warm air
thermal, thermic, caloric(adj)
relating to or associated with heat
"thermal movements of molecules"; "thermal capacity"; "thermic energy"; "the caloric effect of sunlight"
of or relating to a hot spring
caused by or designed to retain heat
"a thermal burn"; "thermal underwear"
A column of rising air in the lower atmosphere created by uneven heating of Earth's surface.
pertaining to heat or temperature.
providing efficient insulation so as to keep the body warm.
Origin: From *, from θέρμη.
of or pertaining to heat; warm; hot; as, the thermal unit; thermal waters
A thermal column is a column of rising air in the lower altitudes of the Earth's atmosphere. Thermals are created by the uneven heating of the Earth's surface from solar radiation, and are an example of convection, specifically atmospheric convection. The Sun warms the ground, which in turn warms the air directly above it. Dark earth, urban areas and roadways are good sources of thermals. The warmer air near the surface expands, becoming less dense than the surrounding air mass. The mass of lighter air rises, and as it does, it cools due to it expands in the lower pressure of the higher altitude. It stops rising when it has cooled to the same temperature as the surrounding air. Associated with a thermal is a downward flow surrounding the thermal column. The downward moving exterior is caused by colder air being displaced at the top of the thermal. The size and strength of thermals are influenced by the properties of the lower atmosphere. Generally, when the air is cold, bubbles of warm air are formed by the ground heating the air above it and can rise like a hot air balloon. The air is then said to be unstable. If there is a warm layer of air higher up, an inversion can prevent thermals from rising high and the air is said to be stable.
Chambers 20th Century Dictionary
thėr′mal, adj. pertaining to heat: warm.—n. Therm, a thermal unit.—n.pl. Ther′mæ, hot springs or baths.—adv. Ther′mally.—n. Thermatol′ogy, the science of the treatment of disease by heat, esp. by thermal mineral waters.—adj. Ther′mic, thermal.—adv. Ther′mically.—ns. Thermobarom′eter, an apparatus for measuring pressure of the atmosphere from the boiling-point of water; Thermochem′istry, that branch of chemistry which treats of the relations between chemical action and heat; Ther′mochrosy, the property possessed by rays of radiant heat of having varying wave-lengths and degrees of refrangibility; Ther′mo-curr′ent, a thermo-electric current.—adj. Ther′mo-dynam′ic.—n. Ther′mo-dynam′ics, the branch of physics which treats of heat as a mechanical agent.—adj. Ther′mo-elec′tric.—ns. Ther′mo-electric′ity, electricity developed by the unequal heating of bodies; Ther′mo-electrom′eter, an instrument for measuring the strength of a current of electricity by its effect in producing heat; Thermogen′esis, the production of heat, esp. in the body by physiological processes.—adjs. Thermogenet′ic, Thermogen′ic.—ns. Ther′mogram, the record made by a thermograph; Ther′mograph, an automatic self-registering thermometer; Thermog′raphy, any process of writing involving the use of heat; Ther′mo-mag′netism, magnetism as modified or produced by the action of heat on the body magnetised or on the medium surrounding it; Thermomet′rograph, a self-registering thermometer; Ther′mo-pile, a thermo-electric battery used as a thermometer; Ther′moscope, an instrument for detecting changes of temperature without measuring them accurately.—adj. Thermoscop′ic.—adv. Thermoscop′ically.—n. Ther′mostat, an appliance for showing temperatures automatically by the expansion of substances—used in regulating steam pressures, &c.—adj. Thermostat′ic.—adv. Thermostat′ically.—adjs. Thermot′ic, -al, pertaining to heat.—n. Thermot′ics, the science of heat. [Gr. thermos, hot—thermē, heat—therein, to heat.]
The numerical value of Thermal in Chaldean Numerology is: 6
The numerical value of Thermal in Pythagorean Numerology is: 5
Sample Sentences & Example Usage
We produce 40-45 percent of all our electricity here using geo-thermal power plants.
We will consider reducing thermal coal output or selling stakes in thermal coal mines.
Switching the fuel at thermal power plants from coal to natural gas will allow the country to greatly reduce greenhouse gas emissions.
Even though the use of coal has been blamed as a cause of the heavy smog, and the government has outlined plans to curb air pollution, the amount of thermal power generated won't decrease in the near future.
The reason for this is the amount of thermal coal sold on the open market is very small compared to that sold under contract. Contracts can cover multiple years, and prices may have been agreed well before the current market's lows.
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