Eli5 : Why are sparks created when microwaving metal?

Question

Eli5 : Why are sparks created when microwaving metal?

In: 5

Answer 1

Metal, like a spoon, doesn’t always create sparks in a microwave though. And sometimes it can actually be safer to put a spoon in a glass of water when you heat it. Because the spoon can reduce the risk of the water getting superheated (above boiling temperature without actually boiling).

https://physics.stackexchange.com/questions/234042/should-i-place-a-spoon-in-a-cup-of-liquid-before-heating-it-in-a-mircowave