Heat \Heat\ (h[=e]t), n. [OE. hete, h[ae]te, AS. h[=ae]tu, h[=ae]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 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}.
Note: As affecting the human body, heat produces different sensations, which are called by different names, as heat or sensible heat, warmth, cold, etc., according to its degree or amount relatively to the normal temperature of the body.
2. 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}.
3. 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! --Milton.
4. 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. --Addison.
The heats smiths take of their iron are a blood-red heat, a white-flame heat, and a sparkling or welding heat. --Moxon.
5. 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.
6. 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. --Dryden.
[He] struck off at one heat the matchless tale of ``Tam o' Shanter.'' --J. C. Shairp.
7. Utmost violence; rage; vehemence; as, the heat of battle or party. ``The heat of their division.'' --Shak.
8. Agitation of mind; inflammation or excitement; exasperation. ``The heat and hurry of his rage.'' --South.
9. Animation, as in discourse; ardor; fervency; as, in the heat of argument.
With all the strength and heat of eloquence. --Addison.
10. (Zo["o]l.) Sexual excitement in animals; readiness for sexual activity; estrus or rut. [1913 Webster +PJC]
11. Fermentation.
12. Strong psychological pressure, as in a police investigation; as, when they turned up the heat, he took it on the lam. [slang] [PJC]
{Animal heat}, {Blood heat}, {Capacity for heat}, etc. See under {Animal}, {Blood}, etc.
{Atomic heat} (Chem.), the product obtained by multiplying the atomic weight of any element by its specific heat. The atomic heat of all solid elements is nearly a constant, the mean value being 6.4.
{Dynamical theory of heat}, that theory of heat which assumes it to be, not a peculiar kind of matter, but a peculiar motion of the ultimate particles of matter.
{Heat engine}, any apparatus by which a heated substance, as a heated fluid, is made to perform work by giving motion to mechanism, as a hot-air engine, or a steam engine.
{Heat producers}. (Physiol.) See under {Food}.
{Heat rays}, a term formerly applied to the rays near the red end of the spectrum, whether within or beyond the visible spectrum.
{Heat weight} (Mech.), the product of any quantity of heat by the mechanical equivalent of heat divided by the absolute temperature; -- called also {thermodynamic function}, and {entropy}.
{Mechanical equivalent of heat}. See under {Equivalent}.
{Specific heat of a substance (at any temperature)}, the number of units of heat required to raise the temperature of a unit mass of the substance at that temperature one degree.
{Unit of heat}, the quantity of heat required to raise, by one degree, the temperature of a unit mass of water, initially at a certain standard temperature. The temperature usually employed is that of 0[deg] Centigrade, or 32[deg] Fahrenheit.
Heat \Heat\ (h[=e]t), v. t. [imp. & p. p. {Heated}; p. pr. & vb. n. {Heating}.] [OE. heten, AS. h[=ae]tan, fr. h[=a]t hot. See {Hot}.] 1. 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. --Shak.
2. To excite or make hot by action or emotion; to make feverish.
Pray, walk softly; do not heat your blood. --Shak.
3. To excite ardor in; to rouse to action; to excite to excess; to inflame, as the passions.
A noble emulation heats your breast. --Dryden.
Heat \Heat\, v. i. 1. 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.
2. 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 \Heat\ (h[e^]t), imp. & p. p. of {Heat}. Heated; as, the iron though heat red-hot. [Obs. or Archaic] --Shak.
Ahmed Shah, a guerrilla designated by the rebel alliance to head an all-rebel interim government, stood in the 95-degree heat and told the crowd his administration would soon move into Afghanistan. He gave no deadline.
Operators of the Seabrook nuclear power plant warmed the reactor for its first low-power testing, but opponents planned to turn up some heat of their own with a new round of mass protests.
The poison, mostly vaporized in the heat, pushed past a relief valve, through the pipelines and out the vent tower.
Most corn futures prices climbed the permitted daily limit of 10 cents a bushel Monday on the Chicago Board of Trade as an expected heat wave that is reigniting drought fears moved into the Corn Belt.
Already, the heat has become so intense that a number of firms are seeking less-hostile environs.
"We feel very strongly we have observed excess energy," he said. "We feel confident in being able to measure the heat.
They were turned back at the border, their disappointment aggravated by blistering heat, she said.
Whatever the case, strategists don't operate in a vacuum. "You get a lot of heat from your brokers when you're bearish and the market goes up," says Mr. Smith at Prudential Securities.
Dice the butter, put it into a small saucepan with half the tea and heat gently until the butter is melted.
The existence of Neptune's dark spot is mysterious because scientists didn't think the planet had enough heat to drive fierce winds, said Ingersoll.
A police recruit who collapsed from heat stroke and dehydration Sept. 19 on the first day of boot camp-like training at an academy in Agawam has died, officials said today.
Every play kicked up a cloud of dust, and the women panted and puffed in the 90-degree heat.
One person apparently died from the heat.
The SEC is pondering the step as the political heat over the issue has reached searing levels.
"We'll be open to anyone offering a good service at a good price." Whatever heat TV Guide feels from competitors, it is still the leading TV magazine and one of the most widely read magazines anywhere.
The heat vaporized the glycerin and nicotine in the dried tobacco as well as the flavorings.
The powdered food is made into a sticky dough with the addition of heat and water.
Among the defects were separations in the bonded adhesive insulation that helps hold the joints together, and channels that would allow the fiery gas to reach the joint's middle O-ring, one of three designed to contain heat from the burning fuel.
"We have been camped out in front of the fireplace making memories," she said. "The best Christmas present was the heat and hot water." In Sacramento, Calif., Wednesday brought a record low for the seventh consecutive day - 23 degrees.
If the heat is too intense, instead of settling into the surface of the vessel the metal salts vaporise and disappear.
The troops are living in Saudi barracks and schools now but a tent city is under construction on the base, as is a portable hospital that already is treating about 15 cases of heat stress a day, according to Air Force officials interviewed today.
The battle would keep the heat on other makers of big computers, such as Unisys Corp., which yesterday reported a $1.3 billion second-quarter loss.
However, similar heat waves and droughts can be expected much more often as a result of future warming, said James E. Hansen, a climatologist at the National Aeronautics and Space Administration's Goddard Institute for Space Studies in New York City.
But in an informal show of hands, the scientists on a panel at the American Physical Society meeting Tuesday voted 8-1 that they were 95 percent confident the excess heat was not produced by nuclear fusion.
Firefighters also battled extreme heat and low humidity to suppress fires in eastern and southern Utah, while a new blaze charred more than 1,000 acres in the Uintah Basin, forcing evacuation of all campgrounds in the area.
Poland is in the midst of a rare summer heat wave, with temperatures in the 90s.
The pond became a breeding ground of disease amid an extended heat wave that summer.
For now, Ambartsumyan is concentrating on getting the remaining homeless among the 190,000 people now living in Leninakan into construction huts and other temporary housing, and getting heat for them before winter.
The packages aim to pull in United Kingdom tourists during the slow season of April 10 to Dec. 15, when blistering daytime heat and steamy nights drive off winter tourists.
Cogeneration is the simultaneous production of electricity and steam heat from a single fuel such as natural gas.