Why can't you put metal in microwaves?
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.
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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