Microwave ovens should use wide-mouth containers when heating liquids, because the heat generated by heating food in a closed container is not easy to dissipate, which makes the pressure in the container too high and easily leads to blasting accidents. Even if you use shells to cook food, you should pierce the shells with needles or chopsticks in advance to avoid bursting after heating, splashing out to pollute the furnace wall or injuring people.

Use a special microwave oven to hold food and put it in the microwave oven for heating. First of all, hot food will deform plastic containers. Second, ordinary plastics will release toxic substances, pollute food and endanger human health. ?

Iron, aluminum, stainless steel, enamel and other utensils are put into the furnace and heated by microwave oven, which will produce electric sparks and reflect microwaves, which will not only damage the furnace body, but also heat immature food.

The characteristics of extended data microwave heating are as follows:

1, dielectric thermal effect. Positive ions in the dielectric and nearby negative electrons exist in pairs, and these electrons are closely combined and do not interact with each other, so to the outside world, the overall electric field intensity of the medium is zero. If a strong electric field is applied to the dielectric, the positive and negative electron pairs will be rearranged immediately. If the electric field is alternating and high frequency, the frequent rotation of intermolecular electron pairs will vibrate and generate heat due to friction.

2. The penetration depth of microwave. When the microwave enters the dielectric, the microwave intensity will gradually weaken because the dielectric loss absorbs the microwave energy. Microwave energy will decay according to a certain law.

3. Selection of microwave heating mode. The absorption and heating of microwave are related to the loss coefficient. If the food with large loss coefficient and the food with small loss coefficient are mixed together for heating, the heating effect is a problem worthy of attention.

Generally speaking, materials with low loss coefficient (such as glass, plastics, ceramics, etc. ) is used as a heating container to which food is added. In this way, the microwave can only heat the food, and the container will not heat up. This is what we know in our daily life. Microwave ovens can heat ceramics, glass, plastics and other foods. When the wet material is heated, the part with more water will be heated and dried quickly, and then the other parts will be heated gradually because of its large loss coefficient. This can speed up drying.

References:

Microwave heating _ Baidu Encyclopedia