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 ?
is thrilled to announce that as from 24th March 2014, the microwaveable burger and sandwich brand has become Morrisons' preferred brand in the Microwave Snacking Category.
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Consumers like these are very attracted to products in packages like the Tetra Wedge Aseptic Microwaveable because it provides them with the opportunity to make high-quality food right in their microwave.
Promising to taste "like mom used to make," Bob Evans' Green Bean Casserole features fresh cut green beans with mushroom sauce and crunchy onion topping in a convenient microwaveable container.
The range concentrates on snack and finger food favorites, running the gamut from microwaveable Chicken Burger twin-packs in 140-gram boxes to Cheese-filled Jalapenos and Mozzarella Sticks (with red pepper dip) in 300-grain boxes.
Stimulate ideation and invigorate brands by learning from best practice examples specifically from the hot microwaveable snack sector, with support
Whatever the solution, the problem is one the manufacturers are very much concerned about, because microwaveable foods are big business.
Other types of microwaveable tube foods, including scrambled eggs with sausage, mac and cheese, and pasta, will hit supermarket shelves soon.
Combine orange juice and gelatin in a large microwaveable glass bowl.