AskDefine | Define boiling

Dictionary Definition

boiling

Noun

1 the application of heat to change something from a liquid to a gas
2 cooking in a boiling liquid [syn: stewing, simmering] adv : extremely; "boiling mad"

User Contributed Dictionary

English

Pronunciation

Verb form

boiling
  1. present participle of boil

Noun

  1. The process of changing the state of a substance from liquid to gas by heating it past its boiling point.

Translations

process of changing the state of a substance
  • Czech: var
  • French: ébullition

Adjective

boiling (not comparable)
  1. That boils or boil.
    boiling kettle
    boiling oil
  2. In the context of "of a thing|informal": Extremely hot.
    The radiator is boiling – I'm going to turn it down a bit.
  3. In the context of "of a person|informal": Feeling uncomfortably hot.
    I'm boiling – can't we open a window?
  4. In the context of "of the weather": Very hot.
    It's boiling out today!

Translations

that boil(s)
of a thing: extremely hot
of a person: feeling uncomfortably hot
  • Hebrew: קודח (ill with high temperature)
of the weather: very hot
  • Hebrew: לוהט

Extensive Definition

Boiling (also called ebullition), a type of phase transition, is the rapid vaporization of a liquid, which typically occurs when a liquid is heated to its boiling point, the temperature at which the vapor pressure of the liquid is equal to the pressure exerted on the liquid by the surrounding environmental pressure. Thus, a liquid may also boil when the pressure of the surrounding atmosphere is sufficiently reduced, such as the use of a vacuum pump or at high altitudes. Boiling occurs in three characteristic stages, which are nucleate, transition and film boiling. These stages generally take place from low to high surface temperatures, respectively.

Nucleate boiling

Nucleate boiling is characterized by the incipience and growth of bubbles on a heated surface, which rise from discrete points on a surface, whose temperature is only slightly above the liquid’s saturation temperature. In general, the number of nucleation sites are increased by an increasing surface temperature. An irregular surface of the boiling vessel (i.e. increased surface roughness) can create additional nucleation sites, while an exceptionally smooth surface, such as glass, lends itself to superheating. Under special conditions, a heated liquid may show boiling delay when heated over its boiling point, by starting to thermal conductivity, this vapor layer insulates the surface. This condition of a vapor film insulating the surface from the liquid characterizes film boiling.

Transition boiling

Transition boiling may be defined as the unstable boiling, which occurs at surface temperatures between the maximum attainable in nucleate and the minimum attainable in film boiling.
The formation of bubbles in a heated liquid is a complex physical process which often involves cavitation and acoustic effects, such as the broad-spectrum hiss one hears in a kettle not yet heated to the point where bubbles roil the surface.

Boiling in cookery

In cookery, boiling is cooking food in boiling water, or other water-based liquid such as stock or milk. Simmering is gentle boiling, while in poaching the cooking liquid moves but scarcely bubbles.
The open-air boiling point of water is typically considered to be 100 C degrees. Pressure and a change in composition of the liquid may alter the boiling point of the liquid. For this reason, high elevation cooking generally takes longer since boiling point is a function of atmospheric pressure. In Denver, Colorado, which is at an elevation of about one mile, water boils at approximately 95 C. http://www.iapws.org/faq1/boil.htm Depending on the type of food and the elevation, the boiling water may not be hot enough to cook the food properly. Similarly, increasing the pressure as in a pressure cooker raises the temperature of the contents above the open air boiling point.
Adding a water soluble substance, such as salt or sugar also increases the boiling point. This is called boiling-point elevation. However, the effect is very small, and the boiling point will be increased by an insignificant amount. On the other hand, salt or ethylene glycol can cause significant freezing point depression. Due to variations in composition and pressure, the boiling point of water is almost never exactly 100 C, but rather close enough for cooking.
In places where the available water supply is contaminated with disease-causing bacteria, boiling water and allowing it to cool before drinking it is a valuable health measure. Boiling water for a few minutes kills most bacteria, amoeba, and other microbial pathogens. It thus can help prevent cholera, dysentery, and other diseases caused by microorganisms.
Foods suitable for boiling include fish, vegetables, farinaceous foods such as pasta, eggs, meats, sauces, stocks and soups.
Boiling has several advantages. It is safe and simple, and it is appropriate for large-scale cookery. Older, tougher, cheaper cuts of meat and poultry can be made digestible. Nutritious, well flavoured stock is produced. Also, maximum color and nutritive value is retained when cooking green vegetables, provided boiling time is kept to the minimum.
On the other hand, there are several disadvantages. There is a loss of soluble vitamins from foods to the water, and boiled foods can look unattractive. Boiling can also be a slow method of cooking food.
Boiling can be done in two ways: The food can be placed into already rapidly boiling water and left to cook, the heat can be turned down and the food can be simmered; or the food can also be placed into the pot, and cold water may be added to the pot. This may then be boiled until the food is satisfactory.
Water on the outside of a pot, i.e. a wet pot, increases the time it takes the pot of water to boil. The pot will heat at a normal rate once all excess water on the outside of the pot evaporates.

Boiling for water purification

Boiling is used as a method of water purification. Boiling is commonly advocated as an emergency water treatment method, or as a method of portable water purification in rural or wilderness settings without access to a potable water infrastructure.

See also

boiling in Catalan: Ebullició
boiling in Czech: Var
boiling in German: Sieden
boiling in Estonian: Keetmine
boiling in Modern Greek (1453-): Βρασμός
boiling in Spanish: Ebullición
boiling in French: Ébullition
boiling in Scottish Gaelic: Bruich
boiling in Icelandic: Suða
boiling in Italian: Ebollizione
boiling in Hebrew: הרתחה
boiling in Latvian: Viršana
boiling in Malay (macrolanguage): Pendidihan
boiling in Japanese: 茹でる
boiling in Polish: Wrzenie (fizyka)
boiling in Portuguese: Ebulição
boiling in Russian: Кипение
boiling in Simple English: Boil
boiling in Finnish: Keittäminen
boiling in Swedish: Kokning
boiling in Ukrainian: Кипіння
boiling in Chinese: 沸腾

Synonyms, Antonyms and Related Words

agitation, ardent, baking, barbecuing, basting, blistering, bluster, bobbery, boil, boiling over, braising, brewing, broil, broiling, brouhaha, bubbliness, bubbling, burning, burning hot, burning with excitement, bustle, canicular, carbonation, catering, churn, coction, commotion, conturbation, cookery, cooking, cuisine, culinary science, decoction, discomposure, disorder, disquiet, disquietude, disturbance, domestic science, ebullience, ebulliency, ebullient, ebulliometer, ebullition, effervescence, effervescency, embroilment, excitement, febrile, ferment, fermentation, fervent, fervid, fever, feverish, feverishness, fidgets, fiery, fizz, fizzle, flaming, flap, flurry, flushed, fluster, flutteration, foaming, foment, frothiness, frothing, frying, fume, fuss, glowing, grilling, heated, hectic, het up, home economics, hot, hot as fire, hot as hell, hubbub, hurly-burly, in rut, inquietude, jitters, jumpiness, like a furnace, like an oven, maelstrom, malaise, moil, nerviness, nervosity, nervousness, nutrition, overheated, overwarm, pan-broiling, parching, passionate, perturbation, piping hot, poaching, red-hot, restlessness, roasting, roil, rout, row, sauteing, scalding, scorching, searing, seethe, seething, sexually excited, shirring, simmer, simmering, sizzling, sizzling hot, smoking hot, smoldering, sparkle, spumescence, steaming, steamy, steeping, stewing, stir, sudorific, sweating, sweaty, sweltering, sweltry, swirl, to-do, toasting, torrid, trepidation, trepidity, tumult, tumultuation, turbidity, turbulence, turmoil, twitter, unease, unrest, upset, warm, white-hot
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