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How Microwaves Cook Food. When you hit the start button it usually takes about 2 seconds to heat up a filament inside the magnetron tube, says Schiffmann. The microwaves are then blasted into the food compartment. The commonly used frequency of microwaves, 2.45 gigahertz, is easily absorbed by water, fat, and sugar.
Over-the-Range Microwave: Combination Microwave and Ventilation Hood. Over-the-range microwaves preserve space and do the work of two appliances. While performing the normal cooking duties of a microwave, they also provide ventilation for your stovetop.