Microwaves are a form electromagnetic radiation. Microwaves are used in communications, radar, radio astronomy, Navigation, heating and power applications, and spectroscopy. In 1888, Heinrich Hertz was the fist to demonstrate the existence of radio waves by building a spark gap radio transmitter that produced 450 MHz microwaves.

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A microwave oven, often colloquially shortened to microwave, is a kitchen appliance that heats food by bombarding it with electromagnetic radiation in the microwave spectrum causing polarized molecules in the food to rotate and build up thermal energy in a process known as dielectric heating. Microwave ovens heat foods quickly and efficiently because excitation is fairly uniform in the outer 2538 mm of a dense (high water content) food item; food is more evenly heated throughout (except in thick, dense objects) than generally occurs in other cooking techniques. Percy Spencer invented the first microwave oven after World War II from radar technology developed during the war. Named the 'Radarange', it was first sold in 1947. Raytheon later licensed its patents for a home-use microwave oven that was first introduced by Tappan in 1955, but these units were still too large and expensive for general home use.

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