Why is it okay to put hot stuff in/on aluminum foil, but it doesn’t like being in a microwave?
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Microwaves are radio waves and metal makes great antennas for receiving radio waves as electrical voltages, because metal is a very good conductor of electricity. Microwave ovens are very powerful so the voltages that can build up in the metal are very high and can cause sparks and mini-lightning inside. And while the metal is sucking up much of the power of the oven in this way, the food isn’t being heated properly.
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