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[Phys-L] metal in microwave oven?

On a recent ski trip to Colorado, my friend brought a can of soup on the
mountain. He opened the top, and heated the soup can in the microwave! I
found this hard to believe. I thought that any metal placed in a microwave
oven will produce sparks and damage the interior. Apparently, I was
mistaken. Can someone clarify the physics of metals in microwaves for me?
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