Microwaves heat by causing molecules to rub against each other. Water molecules are the main ones involved so parts of the nuked item that are high in water content will heat up more than those that are drier. That's why you can lick the outside of a microwaved Dolly Madison fruit pie while the inside will fry your tongue. If the entire food item has similar water content than the outside will heat more than the inside because microwaves will be absorbed by outer layers and less will reach the inside.

Regards,
WK


>>>>I'm curious how it heats the middle but not the outside? Everytime I microwave a frozen dinner, the outside gets scalding hot, while the inside sometimes is still frozen, hence I have to reheat it again. Do rodents not warm up the same way? I've never bothered microwaving them, for fear that they would explode inside my microwave (I'm not buying another one for rodents only).

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