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 ?
* Male and female hormone production is shut down and/or altered by continually eating microwaved foods.
* Microwaved foods cause stomach and intestinal cancerous growths.
In 1989, the Swiss food scientist Dr Dans Ulrich Hertel fed eight volunteers a range of raw, conventionally cooked and microwaved food.
An article also appeared a Swiss environmental magazine entitled Journal Franz Weber, which stated that the consumption of food cooked in microwave ovens had cancerous effects on the blood as indicated by an increase of leukocytes, which could indicate cell damage, after eating microwaved substances.
"People who ingested microwaved foods showed a statistically higher incidence of stomach and intestinal cancers, plus a general degeneration of peripheral cellular tissues and a gradual breakdown of the function of the digestive and excretory systems," Kopp wrote.
"The prolonged eating of microwaved foods causes cancerous cells to increase in human blood," says "10 Reasons to Throw Out your Microwave Oven," an article by Joseph Mercola, an Illinois alternative-medicine physician who operates what he says is the "#1 Natural Health Site" on the Internet (www.mercola.com).
Tough acorn and winter squash will be easier to slice if microwaved at High one to two minutes.
Dealler at Leeds University in England parceled out 300-gram servings of refrigerated mashed potatoes both with and without added salt, then microwaved them for 1 minute and measured their core temperatures.
In fact, the flavor profile of her microwaved cake more closely resembled that of batter than that of a "baked" cake.

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