Answer:

Why do metal objects explode when placed inside a working microwave?

When microwaves interact with a metallic material, the electrons on the material's surface get sloshed around, Slepkov explained. This doesn't cause any problems if the metal is smooth all over. But where there is an edge, like at the tines of a fork, the charges can pile up and result in a high concentration of voltage.

"If it's high enough, it can rip an electron off a molecule in the air," creating a spark and an ionized (or charged) molecule, Slepkov said.

Ionized particles absorb microwaves even more strongly than water does, so once a spark appears, more microwaves will get sucked in, ionizing even more molecules so that the spark grows like a ball of fire, he said.

Usually, such an event can occur only in a metal object with rough edges. That's why "if you take aluminum foil and put it in a flat circle, it might not spark at all," Slepkov said. "But if you crumple it into a ball, it will spark quickly."

Why metal inside the microwave does not explode?

Metals like tin, steel, and stainless steel – which is just regular steel doped with chromium –reflect microwave radiations.

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