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Microwave ovens don't heat up vessels if they're microwave proof.

Usually the information relating to their microwave capability will be found on the base of the vessels.

If you use a vessel which isn't microwave proof it will heat up, very possibly dangerously so: it will be likely to crack or explode.

To test for microwave proofing, if there's no information on your vessel, put the item into your microwave with a vessel you know to be microwave proof - maybe a coffee mug. Fill it with water; this will help protect your oven; its magnetron won't cope well with unsuitable vessels .

Heat for half a minute. At the end of that time your mug of water will have heated, but your untested vessel will also have become hot. If this happens, never, ever use that vessel in a microwave oven; you risk at best the thing cracking open and making a heck of a mess of your oven interior and at worst might cause injury to someone removing it from the oven.

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Q: Why microwave oven does not heat up the vessels?
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