• A 17th-century lime kiln excavated at Jamestown. In it oyster shells from the James River were burned for making lime. The iron hoops which supported the arched top of the kiln buckled from the intense heat
    A 17th-century lime kiln excavated at Jamestown. In it oyster shells from the James River were burned for making lime. The iron hoops which supported the arched top of the kiln buckled from the intense heat
  • WordNet 3.6
    • v heat make hot or hotter "the sun heats the oceans","heat the water on the stove"
    • v heat gain heat or get hot "The room heated up quickly"
    • v heat arouse or excite feelings and passions "The ostentatious way of living of the rich ignites the hatred of the poor","The refugees' fate stirred up compassion around the world","Wake old feelings of hatred"
    • v heat provide with heat "heat the house"
    • n heat utility to warm a building "the heating system wasn't working","they have radiant heating"
    • n heat the trait of being intensely emotional
    • n heat the presence of heat
    • n heat the sensation caused by heat energy
    • n heat a preliminary race in which the winner advances to a more important race
    • n heat a form of energy that is transferred by a difference in temperature
    • n heat applies to nonhuman mammals: a state or period of heightened sexual arousal and activity
    • ***

Additional illustrations & photos:

Single Pipe Heating Apparatus for Dry Kilns Single Pipe Heating Apparatus for Dry Kilns
Double Pipe Heating Apparatus for Dry Kilns Double Pipe Heating Apparatus for Dry Kilns
Vertical Pipe Heating Apparatus for Dry Kilns Vertical Pipe Heating Apparatus for Dry Kilns
In the heat of the day's struggle In the heat of the day's struggle
Heating the Bottle Heating the Bottle

Webster's Revised Unabridged Dictionary
  • Interesting fact: If you yelled for 8 years, 7 months and 6 days, you would have produced enough sound energy to heat one cup of coffee
    • Heat A force in nature which is recognized in various effects, but especially in the phenomena of fusion and evaporation, and which, as manifested in fire, the sun's rays, mechanical action, chemical combination, etc., becomes directly known to us through the sense of feeling. In its nature heat is a mode of motion, being in general a form of molecular disturbance or vibration. It was formerly supposed to be a subtile, imponderable fluid, to which was given the name caloric.
    • Heat A single complete operation of heating, as at a forge or in a furnace; as, to make a horseshoe in a certain number of heats .
    • Heat A violent action unintermitted; a single effort; a single course in a race that consists of two or more courses; as, he won two heats out of three. "Many causes . . . for refreshment betwixt the heats .""He] struck off at one heat the matchless tale of “Tam o' Shanter.”"
    • Heat Agitation of mind; inflammation or excitement; exasperation. "The heat and hurry of his rage."
    • Heat Animation, as in discourse; ardor; fervency; as, in the heat of argument. "With all the strength and heat of eloquence."
    • Heat Fermentation.
    • Heat hĕt Heated; as, the iron though heat red-hot.
    • Heat High temperature, as distinguished from low temperature, or cold; as, the heat of summer and the cold of winter; heat of the skin or body in fever, etc. "Else how had the world . . . Avoided pinching cold and scorching heat !"
    • Heat Indication of high temperature; appearance, condition, or color of a body, as indicating its temperature; redness; high color; flush; degree of temperature to which something is heated, as indicated by appearance, condition, or otherwise. "It has raised . . . heats in their faces.""The heats smiths take of their iron are a blood-red heat , a white-flame heat , and a sparkling or welding heat ."
    • Heat (Zoöl) Sexual excitement in animals; readiness for sexual activity; estrus or rut.
    • Heat Strong psychological pressure, as in a police investigation; as, when they turned up the heat, he took it on the lam.
    • Heat The sensation caused by the force or influence of heat when excessive, or above that which is normal to the human body; the bodily feeling experienced on exposure to fire, the sun's rays, etc.; the reverse of cold.
    • Heat To excite ardor in; to rouse to action; to excite to excess; to inflame, as the passions. "A noble emulation heats your breast."
    • Heat To excite or make hot by action or emotion; to make feverish. "Pray, walk softly; do not heat your blood."
    • Heat To grow warm or hot by fermentation, or the development of heat by chemical action; as, green hay heats in a mow, and manure in the dunghill.
    • Heat To grow warm or hot by the action of fire or friction, etc., or the communication of heat; as, the iron or the water heats slowly.
    • Heat To make hot; to communicate heat to, or cause to grow warm; as, to heat an oven or furnace, an iron, or the like. "Heat me these irons hot."
    • Heat Utmost violence; rage; vehemence; as, the heat of battle or party. "The heat of their division."
    • ***
Century Dictionary and Cyclopedia
  • Interesting fact: Soil that is heated by geysers are now making it possible to produce bananas in Iceland
    • n heat A sensation of the kind produced by close proximity to fire. The sensation of heat is commonly described as opposite in character to that of cold; but, strictly considered, this opposition lies not so much in these sensations themselves as in their causes and associations. Like cold, the sensation of heat probably resides only in special points of the skin, the points sensitive to heat being different in location from those which are sensitive to cold.
    • n heat That condition of a material body which is capable of producing the sensation of heat; in physics, the corresponding specific form of energy, consisting in an agitation of the molecules of matter, and measured by the total kinetic energy of such agitation. See energy, 7. Heat is of two kinds—heat proper, resident in a body, and radiant heat, which, from the physical point of view, is not properly heat at all, but, like light, a form of wave-motion projected by the vibrations of the luminiferous ether. Heat was formerly believed to be caused by an indestructible material fluid, called caloric. It is now known to be not a substance, but the energy of molecular motion, consisting, in the case of a gas, of nearly uniform rectilinear motions, with sudden changes of direction and velocity when the molecules come near enough to one another; in the case of a liquid, of irregular wanderings of its molecules; and in the case of a solid, of orbital or oscillatory motions. This motion entirely ceases only at the absolute zero point. The temperature is in fact nothing but the amount of heat per molecule. The effects of absorbed heat upon a body are: Increase of temperature—that is, increase of the heat of each molecule. To a limited extent this can be measured by the senses, but more accurately by thermometers (see thermometer), the thermopile, etc. Expansion, or increase of volume (see expansion). Change of state, as of a solid to a liquid (see fusion and liquefaction), or of a liquid to a gas (see vaporization). Thus, to transform ice at 0° C. into water (melt it), or water at 100° C. into vapor or steam, a large amount of heat is required. This heat disappears as sensible heat, and is said to become latent. Latent heat, however, is a misleading term, for it is not true that heat is latent as such, but only that so much heat-energy has been expended in changing the position of the molecules and overcoming their mutual attractions. If the process is reversed, this latent heat becomes sensible, as, for example, when steam is condensed in a steam-radiator. Heat also produces electrical effects (see electricity), and is instrumental in initiating chemical changes. Heat may be transmitted from one place to another— By convection (see convection), when the hot body is itself moved, as in heating by hot air conveyed in flues, or by hot water carried in pipes. By conduction (see conduction), where the heat travels slowly through the mass of the body, as when one end of an iron bar is thrust into the fire and the other end gradually becomes heated. In this case it is the molecular motion of the iron which is propagated. By radiation (see radiation). When heat was believed to be a substance, the radiation of heat was explained, in a manner analogous to the abandoned emission theory of light (see light), as the actual transfer of the heat-fluid itself; now, however, radiant heat is known to be the energy of heat transferred to the luminiferous ether (sec ether), which fills all space and also pervades all bodies. The hot body sets the ether-particles in vibration, and this vibratory motion, in the form of waves, travels in all directions and with a velocity of about 186,000 miles per second. If this radiant heat impinges upon a body, part of it may be absorbed, or, in other words, the molecules of the body may themselves be set in motion by the ether-waves. There is no essential difference between radiant heat and light, both being forms of radiant energy (see energy), the ether-waves differing intrinsically among themselves in wave-length only, and thus producing different effects, heating, luminous, and chemical, in the bodies upon which they impinge, according to the nature of these bodies. The rays whose heating effect is generally the greatest are of greater wave-length than those which most affect the eye (light-rays), and have longer periods of vibration. Like light-rays, they may be reflected, refracted, diffracted, and polarized. The quantity of heat of a body, or the amount of heat-energy which a body gains or loses in passing through a given range of temperature, is measured in thermal units (see heat-unit)—that is, by the quantity of water which it would raise through 1° C. (or 1° F.); it is given by the product of its weight into the number expressing the range in temperature multiplied by the specific heat. In ordinary speech heat and temperature are not distinguished. See temperature.
    • n heat In ordinary use, a sensibly high temperature, as the warmth of the sun, or of the body.
    • n heat A heating, as of a piece of iron to be wrought by a blacksmith, or of a mass of metal to be melted in a furnace; an exposure to intense heat.
    • n heat Hence Violent action; high activity; intense and uninterrupted effort: as, to do a thing at a heat.
    • n heat Especially— A single course in a horse-race or other contest.
    • n heat A division of a race or contest when the contestants are too numerous to run at once, the race being finally decided by the winners (or winners and seconds) of each division running a final race or heat.
    • n heat Indication of high temperature, as the condition or color of the body or part of the body; redness; high color.; flush.
    • n heat Vehemence; rage; violence; excitement; animation; fervency; ardor; zeal: as, the heat of battle or of argument; the heat of passion or of eloquence.
    • n heat Sexual desire or excitement in animals, especially in the female, corresponding to rut in the male; the period or duration of such excitement: as, to be in heat.
    • heat To cause to grow warm; communicate heat to; make hot: as, to heat an oven or a furnace; to heat iron. See heat, n., 2.
    • heat To make feverish; stimulate; excite: as, to heat the blood.
    • heat To warm with emotion, passion, or desire; rouse into action; animate; encourage.
    • heat To run a heat over, as in a race.
    • heat To grow warm or hot; come to a heated condition, from the effect either of something external or of chemical action, as in fermentation or decomposition.
    • n heat The quantity or weight of metal undergoing a metallurgical process. See heat. 4.
    • n heat In electricity, that portion of the heat developed in an electric circuit which cannot be converted directly into electrie energy. The total heat in an electric circuit is HJ= IRt + PIt, where H is the heat in calories, J is the mechanical equivalent, I the current, R the resistance, t the time during which the current flows, and P is the difference of potential due to the heating of any metal junctions that may exist in the circuit. The term IRt represents the irreversible heat. Also called ohmic heat. Compare reversible heat.
    • n heat The heat in calories required to convert a gram of liquid at its melting-point into saturated vapor at a given pressure.
    • ***
Chambers's Twentieth Century Dictionary
  • Interesting fact: Heat is better retained in moist air than in dry air,which is why tropical nights are warm and desert nights are cold.
    • n Heat hēt that which excites the sensation of warmth: sensation of warmth: a heating: exposure to intense heat: a warm temperature: the warmest period, as the heat of the day: indication of warmth, flush, redness: vehemence, passion; sexual excitement, or its period, esp. of the female, corresponding to rut in the male: a single course in a race: animation
    • v.t Heat to make hot: to agitate
    • v.i Heat to become hot:—pr.p. heat′ing; pa.p. heat′ed
    • ***


  • Elizabeth Ashley
    Elizabeth Ashley
    “Absence does not make the heart grow fonder, but it sure heats up the blood.”
  • Ralph Waldo Emerson
    “A man makes inferiors his superiors by heat; self-control is the rule.”
  • Dante Alighieri
    “Heat cannot be separated from fire, or beauty from the eternal.”
  • Harry S Truman
    “If you can't stand the heat, get out of the kitchen.”
  • Caroline Schoeder
    Caroline Schoeder
    “Some people change their ways when they see the light, others when they feel the heat.”
  • George Eliot
    “Iteration, like friction, is likely to generate heat instead of progress.”


Dead heat - If a race ends in a dead heat, two or more finish with exactly the same result.
If you can't stand the heat, get out of the kitchen - Originally a Harry S. Truman quote, this means that if you can't take the pressure, then you should remove yourself from the situation.
More heat than light - If a discussion generates more heat than light, it doesn't provide answers, but does make people angry.
Take the heat - If you take the heat, you take the criticism or blame for something you didn't do, normally to protect the guilty person.


Webster's Revised Unabridged Dictionary
OE. hete, hæte, AS. hǣtu, hǣto, fr. hāt, hot; akin to OHG. heizi, heat, Dan. hede, Sw. hetta,. See Hot


In literature:

The atmospheric heat had passed, and the men stood shivering in the water.
"The Golden Woman" by Ridgwell Cullum
In the act of compressing the air I produce heat, and the heat, as you see, fires my tinder.
"The Story of a Tinder-box" by Charles Meymott Tidy
Although heat expands things, yet expansion does not heat them.
"Common Science" by Carleton W. Washburne
I know there's heat and plenty of it down below.
"Two Thousand Miles Below" by Charles Willard Diffin
High fever and heat strokes are treated in this way.
"Special Report on Diseases of Cattle" by U.S. Department of Agriculture
This I can say, that such heat is more endurable than common heat.
"The Turkish Bath" by Robert Owen Allsop
The heat was oppressing.
"Astounding Stories, April, 1931" by Various
The water in them evaporates more quickly when it is heated because all we mean by "heating" is speeding up the molecules.
"Letters of a Radio-Engineer to His Son" by John Mills
Now I was young, and none too well disciplined, heated by contest, and very angry at having been so unexpectedly attacked at the beginning.
"Gold" by Stewart White
Heat the kiln well before putting on the hops; keep a steady and regular heat while drying.
"Soil Culture" by J. H. Walden

In poetry:

Let us walk. We soon must part--
All too soon! but he may miss!
Give me but another kiss;
It will heat my heart
"A Guinevere" by Madison Julius Cawein
God whose breast is rest
In the time of strife,
In thy secret breast
Sheltering souls opprest
From the heat of life;
"Christmas Antiphones" by Algernon Charles Swinburne
"And when the Summer Heat is great,
And every hour intense,
The Moghra, with its subtle flowers,
Intoxicates the sense."
"Story Of Udaipore: Told" by Laurence Hope
And once across the heated close
Light laughter in a silver shower
Fell from fair lips: the poet rose
And cursed the hour.
"The Poet's Song" by Archibald Lampman
Then down we sat upon the seat,
So placed that we could view
For miles the landscape in the heat,
The river running through.
"The Last Sweet Walk" by Alexander Anderson
"Traveller, hurrying from the heat
Of the city, stay thy feet!
Rest awhile, nor longer waste
Life with inconsiderate haste!
"Songo River. (Birds Of Passage. Flight The Fourth)" by Henry Wadsworth Longfellow

In news:

With the heating season upon us, Wisconsin Public Service reminds qualified low-income customers there are dollars available to help with heating bills.
Heat a sauté pan to medium heat.
Beware of heat exhaustion as summer heats up.
Two wall-mounted Lochinvar Knight WBN series boilers service 11 zones of high-temperature forced hot water heat, four zones of in-floor radiant heating and a snow melt system on the driveway.
OKLAHOMA CITY – Miami Heat coach Erik Spoelstra calls him the Heat's most important player.
Meanwhile, make caramel filling by heating unwrapped caramels and whipping cream in a small saucepan over low heat, stirring frequently, until caramels are melted and mixture is smooth.
Reduce heat and simmer uncovered over medium heat until the carrots are very tender, about 45 minutes.
Heat the remaining 2 tablespoons of oil in the skillet over medium heat.
Pre-heat fryer to medium heat.
Heat the olive oil in a small skillet over medium heat.
In a large pot, heat oil over medium-high heat.
During his career he served as publisher of Paint & Coatings Industry, Industrial Heating, Ceramic Industry magazines, and he founded Process Heating and Adhesives & Sealants Industry magazines.
Meanwhile, heat 1 tablespoon olive oil in a skillet over medium heat.
If the windows turn a room into a sauna in the summer and a fridge in the winter, some touchups can lower winter heating bills and minimize summer heat.
In a medium saucepan, heat butter over medium heat.

In science:

These externally heated cooling flows are compared with flows that only experience internal supernova-based heating.
Entropy Evolution in Galaxy Groups and Clusters; A Comparison of External and Internal Heating
While this clearly supports the argument for cosmic pre-heating that has been widely discussed, we note that the amount of pre-heating required cannot be explained solely by supernova heating associated with normal star formation (e.g.
Entropy Evolution in Galaxy Groups and Clusters; A Comparison of External and Internal Heating
In our final series of GA models the external pre-heating assumption is replaced with internal heating by Type II supernovae associated with star formation at time t∗ = 2 Gyrs and redshift z∗ = 3 (see also Loewenstein 2000; Bryan 2000).
Entropy Evolution in Galaxy Groups and Clusters; A Comparison of External and Internal Heating
Nomenclature: g, pc, and c represent group, poor cluster and cluster potentials; 1 indicates no pre-heating and 3 → 4 represent increasing levels of pre-heating; nr indicates no reset.
Entropy Evolution in Galaxy Groups and Clusters; A Comparison of External and Internal Heating
In the thermodynamic limit the singular part of specific heat diverges according to Cs ≈ A± |h − hc |−α , where the amplitudes A+ and A− refer to h > hc and h < hc respectively, and α is the specific heat exponent.
Specific-Heat Exponent of Random-Field Systems via Ground-State Calculations