Online Google Dictionary

preheat 中文解釋 wordnet sense Collocation Usage Collins Definition
Verb
/prēˈhēt/,
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preheated, past participle; preheated, past tense; preheating, present participle; preheats, 3rd person singular present;
  1. Heat (something, esp. an oven or grill) beforehand
    • - preheat the oven to 350°
  1. heat beforehand; "Preheat the oven!"
  2. to heat something in preparation for further action, especially cooking
  3. (Preheating) The application of heat to a base metal prior to a welding or cutting operation.
  4. (Preheating) (1) A preliminary heating of ingots‚ billets‚ or forgings to reduce the hazards of thermal shock upon subsequent heating to higher temperatures. ...
  5. (Preheating) Warming of parts prior to application of coating, recommended when adhesion is critical and when parts are being coated in humid atmospheres. In some cases, this technique can be used to achieve higher-than- normal film builds.
  6. (Preheating) Heating to an appropriate temperature immediately prior to austenitizing when hardening high- hardenability constructional steels, many of the tool steels, and heavy sections.
  7. (Preheating) General term used to describe heating applied as preliminary to further thermal or mechanical treatment.
  8. (Preheating) The heating of an impregnated material prior to molding, to facilitate the operation or to reduce the molding cycle.
  9. (Pre-Heating) A common process in which either the weld zone, or whole pieces of thick metal, aluminum or iron castings are preheated in an oven or with a large torch-flame to prevent thermal stresses or uneven expansion and contraction.
  10. (Preheating) A high-temperature soaking treatment used to change the metallurgical structure in preparation for a subsequent operation, usually applied to the ingot.
  11. (Preheating) In F1 mainly pointing to tyre warmers. Preheating is applied before a car is going to drive as to bring the tyres to the best possible temperature to perform at their maximum. ...
  12. (Preheating) The process of heating a glass piece from room temperature to a state sufficient to prevent serious shock when plunged into a flame. This can either be done in a kiln or in the backwash of a flame.
  13. A type of ballast/lamp circuit that uses a separate starter to heat up a fluorescent lamp before high voltage is applied to start the lamp.
  14. A circuit used in fluorescent lamps where the electrodes are heated or warmed to a glow stage, by an auxiliary switch or starter (can be a glow switch, thermal type or mechanical device like a push button) before the lamps are lighted. ...
  15. to prepare oven to correct temperature prior to baking.
  16. To heat the oven to the specified temperature before adding the foods.
  17. A fluorescent system, which requires starters. With this system several seconds of heating time are necessary between the time the circuit is turned on and the time the lamp produces light.
  18. Preheat ballasts can be used with regular fluorescent lamps but require the use of a separate starter, which can be either manual or automatic. A high open circuit voltage will operate the starter which in turn will preheat the cathodes up to temperatures above 950°C. ...
  19. Allowing the oven to warm to the desired temperature before baking. Ideally, one should preheat an oven for at least 20 minutes before baking.
  20. To set an oven or broiler at the desired temperature 15 to 30 minutes before use so that the temperature is reached before food is put in to cook.
  21. An early stage in the sintering procedure when, in a continuous furnace, lubricant or binder burnoff occurs without atmosphere protection prior to actual sintering in the protective atmosphere of the high heat chamber.
  22. To heat an oven or broiler in advance of use to assure that it will be the proper temperature when ready to use.
  23. One method of striking (starting) fluorescent lights. Less starting voltage is needed because the lamp's electrodes are heated before the voltage is applied.
  24. To turn on the heat in an oven for a period of time before cooking a dish, so that the fingers may be burned when the food is put in, as well as when it is removed.
  25. To turn your oven on ahead of time, so that when your cookies are ready for baking, the oven is already at the required temperature.