The microwave oven is the use of food in the microwave field to absorb microwave energy and make their own heating cooking appliances. In the microwave oven microwave generator generated microwave in the microwave oven cavity to establish a microwave electric field, and take certain measures to make this microwave electric field in the oven cavity as evenly distributed, the food into the microwave electric field, by the control center to control the cooking time and the intensity of the microwave electric field, to carry out a variety of cooking processes.
In layman's terms, microwave is a high-frequency electromagnetic wave, which itself does not produce heat, there are microwaves everywhere in the universe, nature, but the existence of nature's microwave, because of the dispersion of non-concentration, so it can not heat the food.
The microwave oven is the use of its internal magnetron, the electrical energy into microwaves to 2450MHZ oscillation frequency penetrate the food, when the microwave is absorbed by the food, food within the polar molecules (such as water, fat, protein, sugar, etc.) that is, attracted to the rate of 2.45 billion per second of rapid oscillation, the macro-expression of this vibration is that the food is heated.
The principle of microwave heating is simple: when the microwave radiation to food, food always contains a certain amount of water, and water is composed of polar molecules (molecules of the positive and negative charge centers, even in the absence of the external electric field is not overlap), the orientation of such polar molecules will be with the change of the microwave field. As a result of this movement of the polar molecules of the water in the food.
As well as the interaction between neighboring molecules, a friction-like phenomenon is produced, which increases the temperature of the water, and therefore the temperature of the food. Food heated by microwaves is heated at the same time as its interior, so that the whole object is heated uniformly and heats up quickly. It heats the food 5cm deep at a frequency of 2.45 billion times per second, accelerating the molecules.
Because microwave is a kind of radiation, there is a wrong view that it will cause cancer. In fact, microwave is a kind of electromagnetic wave, with radio and telegraph used in radio waves, infrared, and visible light is essentially the same thing. The difference lies only in the frequency. The frequency of microwaves is higher than that of radio waves and lower than that of infrared and visible light. Electromagnetic waves in this frequency band are not carcinogenic.