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Dictionary Meaning and Definition on 'Heat'

Heat Meaning and Definition from WordNet (r) 2.0
    heat n
  1. a form of energy that is transferred by a difference in temperature [syn: heat energy]
  2. the presence of heat [syn: hotness, high temperature] [ant: coldness]
  3. the sensation caused by heat energy [syn: warmth]
  4. intense passion or emotion [syn: warmth, passion]
  5. applies to nonhuman mammals: a state or period of heightened sexual arousal and activity [syn: estrus, oestrus, rut] [ant: anestrus]
  6. a preliminary race in which the winner advances to a more important race
  7. utility to warm a building; "the heating system wasn't working"; "they have radiant heating" [syn: heating system, heating plant, heating] v
  8. make hot or hotter; "heat the soup" [syn: heat up] [ant: cool]
  9. provide with heat; "heat the house"
  10. 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" [syn: inflame, stir up, wake, ignite, fire up]
  11. gain heat or get hot; "The room heated up quickly" [syn: hot up, heat up] [ant: cool]
Heat Meaning and Definition from Webster's Revised Unabridged Dictionary (1913)
    Heat \Heat\, n. [OE. hete, h[ae]te, AS. h?tu, h?to, fr. h[=a]t hot; akin to OHG. heizi heat, Dan. hede, Sw. hetta. See Hot.]
  1. 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 if 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. 220 catflap.bishopston.net dictd 1.11.2/rf on FreeBSD 8.1-STABLE <379684.26610.1292136649@catflap.bishopston.net>
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Wikipedia Meaning and Definition on 'Heat'

In physics and thermodynamics, heat is energy transferred from one body or thermodynamic system to another due to thermal contact when the systems are at different temperatures. It is also often described as the process of transfer of energy between physical entities. In this description, it is an energy transfer to the body in any other way than due to work performed on the body.

In engineering, energy transfer by heat between objects is classified as either thermal conduction, first described scientifically by Joseph Fourier, by fluid convection, which is the mixing of hot and cold fluid regions due to pressure differentials, and by thermal radiation, the transmission of electromagnetic radiation described by black body theory.

Thermodynamically, energy can only be transferred by heat between objects, or regions within an object, with different temperatures, a consequence of the zeroth law of thermodynamics. This transfer happens spontaneously only in the direction to the colder body, as per the second law of thermodynamics. The transfer of energy by heat from one object to another object with an equal or higher temperature can happen only with the aid of a heat pump via mechanical work or by using mirrors or lenses to focus electromagnetic radiation which thereby increase its energy flux density.

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'Heat' in famous quotation sentence

* Genius is present in every age, but the men carrying it within them remain benumbed unless extraordinary events occur to heat up and melt the mass so that it flows forth. - Denis Diderot

* All sanity depends on this that is should be a delight to feel heat strike the skin, a delight to stand upright, knowing the bones are moving easily under the flesh. - Doris Lessing

* Truth often suffers more by the heat of its defenders, than from the arguments of its opposers. - William Penn

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