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A microwave oven or simply microwave is an electric oven that heats and cooks food by exposing it to electromagnetic radiation in the microwave frequency range. [1] This induces polar molecules in the food to vibrate [2] and produce thermal energy in a process known as dielectric heating. Microwave ovens heat foods quickly and efficiently ...
In 1967 the first more affordable, $495 (equivalent to $4,523 in 2023), and reasonably sized (counter-top) Radarange brand microwave oven was made available for sale, [2] produced by Amana (a division of Raytheon). [4] Spencer became Senior Vice President and a Senior Member of the Board of Directors at Raytheon. He received 300 patents during ...
Microwave is a form of electromagnetic radiation with wavelengths shorter than other radio waves but longer than infrared waves. Its wavelength ranges from about one meter to one millimeter, corresponding to frequencies between 300 MHz and 300 GHz, broadly construed. [1][2]: 3 [3][4][5][6] A more common definition in radio-frequency engineering ...
The depth of penetration depends on the frequency of the microwaves and the tissue type. The Active Denial System ("pain ray") is a less-lethal directed energy weapon that employs a microwave beam at 95 GHz; a two-second burst of the 95 GHz focused beam heats the skin to a temperature of 130 °F (54 °C) at a depth of 1/64th of an inch (0.4 mm) and is claimed to cause skin pain without lasting ...
The large Aristocrat model featured three ovens and two broilers, weighing 734 pounds. [4] In 1960, a built-in barbecue unit could be added to a cooktop. [8] By 1964, all O'Keefe and Merritt electric ovens had built-in clocks that could be used to turn on the oven, cook for a certain time, and then turn off the oven. [9]
1881; 143 years ago (1881) Tappan is a brand of appliances, named after company founder W. J. Tappan. [1][2] Tappan claimed several innovations: 1930s all- porcelain range available in various colors [2] 1955 the first compact (24") microwave oven [2] 1960s electric ignition for gas ranges [citation needed] 1965 single-unit conventional range ...
At bottom are the vacuum pumps. A hydrogen radio frequency discharge, the first element inside a hydrogen maser (see description below) A maser is a device that produces coherent electromagnetic waves (microwaves), through amplification by stimulated emission. The term is an acronym for microwave amplification by stimulated emission of radiation.
Dielectric heating, also known as electronic heating, radio frequency heating, and high-frequency heating, is the process in which a radio frequency (RF) alternating electric field, or radio wave or microwave electromagnetic radiation heats a dielectric material. At higher frequencies, this heating is caused by molecular dipole rotation within ...