Cover the special bowl for microwave oven to make the hot rice soft and taste better. When cooking hot meals, increase or decrease the time according to the calories. Microwave cooking heating is to increase the kinetic energy of molecules and raise the temperature through the high-speed vibration of polar water molecules. If the food lacks moisture, the effect of heating cooking will be affected.
Therefore, in order to prevent water loss in food, some preventive measures must be taken. If you put food in a container, cover it and cook it, or wrap it in plastic wrap and heat it. This is especially necessary for foods with low water content. On the contrary, if you don't do this, the food will become dry, hard and even burnt. As for reheated rice and cakes, it is best to spray some water on them before heating, and then cover them and cook them.
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In addition, microwave is an electromagnetic wave, which is essentially the same as all infrared rays such as radio waves, radios and telegrams, but with different frequencies. Radio waves and visible light do not cause cancer, and microwaves naturally do not cause cancer.
According to the heating principle, almost all foods contain water. Usually, water molecules are arranged in disorder, but when they are in an electric field, these molecules will rotate with the rotation of the electric field.
When the electric field rotates fast, the water molecules also rotate fast, and the friction between molecules generates heat, which makes the water temperature rise. The electromagnetic wave in the microwave oven rotates more than 2 billion times per second, and the food heating effect is naturally obvious. But in this process, the water molecules themselves are not changed by microwaves.
Specific to the heating energy of microwave, experts say whether this energy will cause harm to human body depends on its intensity. The regulation of the United States is that the power per square centimeter should not exceed 5 milliwatts at a distance of about 5 centimeters from the microwave oven;
China's standard is stricter, which is 1 MW. Moreover, the energy of microwave decreases according to the square of distance, that is, if the energy of microwave oven is 1 MW at 5 cm, it is 0.0 1 MW at 50 cm. Therefore, as long as you buy regular brand products, normal use is harmless to your health.
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