Can I heat liquids in sealed containers?
No, liquids and other foods must not be heated in sealed containers since they are liable to explode. Additionally, microwave heating of beverages can result in delayed eruptive boiling, so care must be taken when handling the container. (Page 4-5)
From the official Toshiba Mw2 Mg20P Wh 3 In 1 Combination Microwave manual, page 4
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