Eli5 : Why are sparks created when microwaving metal?
In: 5
Dielectric heating (microwaving) is when the polarity of a molecule aligns itself in an electromagnetic field and as that undergoes changes like with a microwave oven the molecule rapidly moves heating up in the process. However metal doesn’t absorb the microwaves instead they bounce off the metal and bounce around the inside with nowhere to go until the energy discharges like a thunderstorm inside the microwave. https://youtu.be/V0dtq3rCEjw
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