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Because the microwave will heat up the particles inside the can. Therefore these particles will have more movement energy and the pressure inside the can will build up, causing it to explode. Please post a message on my message board if thes helps! - Chibi Nanas x

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14y ago
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15y ago

because the air inside it expands with heat and has nowhere to go,

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7y ago

As the container heats, it fills with water vapor. This will force (or just move) the lid off. Always have a little gap for the steam (water vapor) to leave.

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Q: Why do you pierce the lid of food when you put it in the microwave?
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