Why can't you put metal in microwaves?

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Under some circumstances, metal can be used in a microwave. The problem is that metal will act as both an antenna, causing the metal to conduct and heat up, and also as a reflector, which can damage the magnetron tube used to generate microwaves by causing high voltage standing waves.

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Food absorbs microwaves causing it to heat food. When microwaves hit metal objects they are reflected which may cause sparks or other more serious damage.

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