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 ?
Microwave ovens are designed with a metal mesh built with holes small enough that microwaves are unable to escape.A
Radiation is often linked to cancer which makes people hesitant to try microwave ovens. Not only the Food and Drug Administration but even the American Cancer Society and World Health Organization have proclaimed microwave ovens safe because the radiation they emit are only electromagnetic in nature, same as the ones in your televisions, radios, and cell phones.
All four of these recipes were tested in a standard 1250-watt microwave oven. If yours has a lower wattage, dishes may need more zapping time; if it's more powerful, they will probably require less.
Customers purchasing LED TVs of 55'' size or above will get a brand new microwave oven along with it and that too without paying a dime extra, he added.
More experiments with microwave ovens. Phys Educ 2004; 39(4):346-351.
Dawlance Pakistan's number one home appliances brand has launched a large capacity digital grill microwave oven (DW-142 G) geared largely towards cooking meals.
Midea microwaves are packed with some of the most advanced and innovative features, including Midea's patented Back Heater design which results in higher temperature inside the microwave oven and also gives uniform heating inside resulting in better tasting & healthy food.
He educated them on the efficient use of Dawlance microwave ovens for cooking and re-heating food.
It didn't take long for the microwave oven to become a must-have home kitchen appliance, as well as an expected fixture anywhere food is prepared--restaurants, break rooms, dorm rooms, hotels, and recreation rooms.
David Watts, general manager for Samsung Professional Appliances, says as budgets get tighter, it is essential to maximise the life of every piece of equipment, including microwave ovens.
Mohammad Saleh Badri, acting director general, Esma, said: "As far as microwave ovens are concerned, the UAE has passed a law that will ensure these products are safe for the consumers.
Summary: DUBAI -- Microwave ovens will soon be subjected to a new law that aims to ensure consumer safety from radiation, according to the Emirates Authority for Standardisation and Metrology (ESMA).

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