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Microwave oven heating principle knowledge explanation

2018-04-24 09:36:25

Microwave oven heating is the most common role that people think of, many people understand the microwave oven, the most common view is that the heating of the microwave oven is through the microwave oven to heat food. So is the microwave heating principle like this? In fact, there is some truth to this popular belief. It is true that microwaves are used to heat plants when they are heated in a microwave oven. The following Xiaobian will tell you about the principle of microwave oven heating.

Microwave oven heating principle

The magnetron of a microwave oven converts electrical energy into microwave energy. When the magnetron emits microwave energy at a frequency of 2450MHZ, the water molecules placed in the oven cavity oscillate at a frequency of 2.45 billion thousand times per second. The core component of the high-frequency electromagnetic field is the magnetron. Food molecules vibrate in the high-frequency magnetic field, and the molecules collide and friction with each other to generate heat energy, which allows the food to be heated. Microwave ovens use this heating principle to cook food.


Microwave is a kind of electromagnetic wave, the energy of this electromagnetic wave is not only much larger than the usual radio waves, this invisible microwave, can penetrate the food up to 5cm deep, and make the water molecules in the food also move, the intense movement produced a lot of heat energy, so the food was' cooked '. That's how microwave heating works.


In the process of microwave heating, the microwave will reflect when it hits the metal, and the metal has no way to absorb or conduct it; Microwaves can pass through insulating materials such as glass, ceramics, and plastics without consuming energy; And food containing water, microwave not only can not pass through, its energy will be absorbed, and when cooking food with ordinary stoves, heat is always gradually from the outside of the food into the inside of the food. With microwave cooking, the heat is directly into the inside of the food, so the cooking speed is 4 to 10 times faster than other stoves, and the thermal efficiency is more than 80%. After understanding the heating principle of the microwave oven, I finally know why I can't use metal tableware to heat in the microwave oven!