Ovens {microwave oven}| can use very-high-frequency radio waves {radar wave}, from a magnetron, which heat food as water absorbs radiation. Radar waves reflect from metal, so oven stays cool. Paper and glass do not absorb radar waves much, so they stay cool. Food cooks evenly.
Practical Affairs>Machine>Kinds>Electric>Microwave
7-Machine-Kinds-Electric-Microwave
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Date Modified: 2022.0224