microwave

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microwave,

electromagnetic wave having a frequency range from 1,000 megahertz (MHz) to 300,000 MHz, corresponding to a wavelength range from 300 mm (about 12 in.) to 1 mm (about 0.04 in.). Like light waves, microwaves travel essentially in straight lines. They are used in radar, in communications links spanning moderate distances, and in other applications, such as microwave ovensmicrowave oven,
device that uses microwaves to rapidly cook food. The microwaves cause water molecules in the food to vibrate, producing heat, which is distributed through the food by induction. A special electron tube called a magnetron produces the microwaves.
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. The equipment used to generate, process, and transmit microwaves is in many respects different from that used with lower frequency radio waves. See waveguidewaveguide,
device that controls the propagation of an electromagnetic wave so that the wave is forced to follow a path defined by the physical structure of the guide. Waveguides, which are useful chiefly at microwave frequencies in such applications as connecting the output
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; magnetronmagnetron
, vacuum tube oscillator (see electron tube) that generates high-power electromagnetic signals in the microwave frequency range. Its operation is based on the combined action of a magnetic field applied externally and the electric field between its electrodes.
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.

microwave

[′mī·krə‚wāv]
(electromagnetism)
An electromagnetic wave which has a wavelength between about 0.3 and 30 centimeters, corresponding to frequencies of 1-100 gigahertz; however, there are no sharp boundaries distinguishing microwaves from infrared and radio waves.

microwave

a. electromagnetic radiation in the wavelength range 0.3 to 0.001 metres: used in radar, cooking, etc.
b. (as modifier): microwave generator

microwave

Meaning "small wave," a microwave is a radio signal in the frequency range from 300 MHz to 300 GHz or from 1 to 300 GHz, depending on the rating system. Except for AM and FM radio, shortwave radio and over-the-air TV, almost all other communications systems transmit microwaves, including satellites, cellular systems, wireless LANs and line-of-sight between buildings and across vast distances. See spectrum and millimeter wave.


Early Microwave Tower
Line-of-sight microwaves were first used to transmit across long distances where the terrain was too difficult to lay cable. This tower was installed in 1969 in Boulder Junction, Colorado. (Image courtesy of AT&T.)
References in periodicals archive ?
Consumers who have similarly experienced severe burns due to Sally Hansen's Microwavable Eyebrow, Face & Lip Wax Kit exploding on them are encouraged to call product liability and personal injury attorneys Wright & McGurk to review their legal options.
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The "Drop Off for Vets" program, sponsored by New York State Senator Nicholas Spano, is asking for donations of non-perishable grocery items such as candy bars, peanut butter, disposable cameras, disposable razors, shaving cream, microwavable popcorn, magazines, gum, and canned goods.
We have microwavable slippers to use if his feet are very cold.
The company also offers Microwavable Roll On waxer, Green Tea & Apple for sensitive skin, Ginseng & Mango for normal skin, Lavender & White Grape for coarse hair and Gigi No More Hair For the Body, which slows unwanted hair regrowth.
It comes with an initial supply of 3-ply VacLoc[R] bags, which are microwavable, boilable, dishwasher-safe, re-usable and re-sealable.
But thanks to a new line of microwavable earmuffs, scarfs, pocket warmers, and seat cushions, you can cheer (or sneer) for the home team without catching the big chill.
It is probably a necessary evil in some instances, but we can often offer a bit of resistance by just saying microwave popcorn, for example, instead of microwavable popcorn.

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