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The Microwave: Where did it come from? | Stuff of Genius

First domestic microwave oven was sold by Tappan. Microwave oven uses electromagnetic radiation with frequencies between 300 MHz and 300 GHz to heat or cook food. The radiation induces polar molecules (mainly water) to rotate. This produces the thermal energy. The discovery of microwave oven was a by-product of radar research in World War 2.
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