Because the heat generated by food heating in a closed container is not easy to dissipate, the pressure in the container is too high and it is easy to cause blasting accidents.

Other things that cannot be heated in the microwave oven:

1, avoid using metal utensils: Because the utensils such as iron, aluminum, stainless steel, enamel, etc. put into the furnace, the microwave oven will generate electric sparks and reflect microwaves when heating, which will not only damage the furnace body but also heat the uncooked food.

2. Avoid refreezing the meat thawed in the microwave oven: Because the meat has been thawed in the microwave oven, the outer layer has actually been heated at a low temperature, and bacteria can reproduce at this temperature. Although refreezing can stop its reproduction, it cannot kill the live bacteria. Meat that has been thawed in the microwave oven must be heated until it is fully cooked if it is frozen in the refrigerator again.

Extended data:

The harm of using microwave oven

1, microwave food produces carcinogenic compounds. Previous studies have shown that microwave-treated meat can produce carcinogens; Amino acids in milk, fruit and cereal will also be converted into carcinogens after microwave; Plant alkaloids in vegetables can also be converted into carcinogens after microwave, which is harmful to health.

2, food nutrition is seriously lost. The food cooked by microwave oven will greatly reduce the minerals, vitamins and nutrients in vegetables, or turn them into carcinogens.

References:

People's Daily Online-Five kinds of food should not be put in the microwave oven. Pay attention to 9 taboos

References:

People's Network-Remember! Six kinds of food should not be heated by microwave oven.