How do microwave ovens work?

The Engineer Guy explains once again how a marvelous piece of tech makes our life easier. The microwave oven is composed of a vacuum tube (called magnetron) with magnets, a wave guide and the chamber to hold the food and radiation inside.

The magnetron generates the microwaves (about 2.43GHz ) and then heats the food from inside out. You can calculate the frequency of the waves if you try to heat up a layer of cheese and measure the distance between the heated parts and the cold ones. The multiply that distance with two and you get the wavelength. Frequency is then the speed of light divided by wavelength. Somebody is geeking out here 😀

Cool science right under our noses. Via [Gizmodo].

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