Microwave ovens are essential household appliances. We have heard that metal cannot be put into microwave ovens. What will be the consequences?
The principle of microwave heating is simply: when microwaves radiate to food, there is always a certain amount of water in the food, and water is composed of polar molecules (the positive and negative charge centers of molecules, even when the external electric field does not exist). coincident), the orientation of this polar molecule will change with the microwave field. Due to this movement of polar molecules of water in food.
And the interaction between adjacent molecules produces a phenomenon similar to friction, which makes the water temperature rise, so the temperature of the food also rises. Foods heated by microwaves are heated inside at the same time, so that the whole object is heated evenly and the temperature rises quickly. At a frequency of 2.45 billion times per second, it penetrates 5cm deep into the food to heat and accelerate the movement of molecules.
