Though a small amount of aluminum foil might not cause problems with your microwave, it's wise to err on the side of caution and never "nuke" metal. When food is microwaved, electromagnetic radiation is created in the form of microwaves, which are absorbed by water inside the food. As a result, molecules in the food vibrate, producing heat and cooking your meal. Microwaving metal lures these waves away from food though, causing trouble.
Risks of Microwaving Aluminum Foil
When microwaves warm up a piece of aluminum foil, they are unable to escape as they do from food, in the form of steam. Instead, the trapped molecules cause the foil to heat up rapidly, which may result in a fire. The foil also prevents the microwaves from reaching your food, leaving it cold. Microwaves may also bounce around the machine erratically as the tinfoil heats up, doing considerable damage.
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