If managed properly, it is completely safe to use metal in a microwave oven. Conventional wisdom is derived from the fact that when mishandled the metal in a microwave oven, this can cause problems.
Microwave oven is a magnetron, which is responsible for sending large amounts of radiation, which are electromagnetic waves with a frequency of about 2.45 GHz when these waves come into contact with the metal, the electrons excite the same, which then begin to move quickly, and microwaves will bounce over them. For this reason, we can say that metal reflects microwaves.
Many other substances, including water and fat reflect microwaves. But instead, they absorb energy, which heats it to be absorbed.
When you put metal in a microwave oven, and the metal is long and pointed, it essentially acts as an antenna for microwave energy. You can create an arc of energy that can produce sparks that tend to scare people. Sparks can get to the edge of the microwave, and can even cause a temperature increase of the magnetron, reducing the life of the microwave oven. Because of the danger to the life of the machine, and the fear of such cases, manufacturers recommend that people do not introduce any kind of metal in the microwave and thus not affect the operation of the microwave.
In fact, one of the greatest dangers that people have the time to put metal in a microwave oven is to choose some kind of metal and this has a little plastic like many of the pots and pans that have metal parts plastic made of polyphenols, which can create an explosion if placed in the microwave. There are, however, pots and pans made specifically to use in the microwave, which are made of metal. These are usually labeled as safe for the microwave, and can be used for many things in the kitchen .
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