What wave is the microwave in the microwave oven?

The microwave in the microwave oven is electromagnetic wave with high frequency and short wavelength, not infrared ray.

High-frequency short-wave electromagnetic waves from 300 MHz to 3000 GHz, wavelength range 1mm to1m. Its wavelength in air is 12.2cm, and that in food is lower than 12 cm.

When electromagnetic waves propagate in different materials, the oscillation frequency will not change in unit time, but the propagation speed v and wavelength of electromagnetic waves will change with the different conductivity and permeability of materials.

Extended data:

The microwave oven power supply provides a high voltage of about 4000 volts to the magnetron. Under the excitation of the power supply, the magnetron continuously generates microwaves, which are coupled into the cooking cavity through the waveguide system.

There is a rotatable agitator near the entrance of the cooking cavity. Because the agitator is a fan-shaped metal, it can reflect microwaves in all directions after rotation, so it can evenly distribute microwave energy in the cooking cavity, thus heating food. The power range of microwave oven is generally 500 ~ 1000 watt.

Generally speaking, shallow, round and straight containers hold food and are heated quickly and evenly, so they should be the first choice. Because microwave heating peripheral food is faster, the thick part should be placed outward, and the small part should be placed in the middle of the container and placed radially on the plate, so that the thick part that is not easy to cook can absorb more microwave energy.