The microwave oven作文500字

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　　People usually think that microwave food is safe. In the United States, more than 90% of households have a microwave oven. Microwave oven is quick and convenient, economical and practical, is the ideal of modern fast rhythm life cooking tools, but the microwave oven has certain harm to human body health.

　　Microwave is very short electromagnetic waves, belongs to the nature part of the energy spectrum. The sun produce microwave, however, produced by the sun produced by microwave has significant difference between microwave and microwave oven. The difference is that the microwave oven is made of alternating current (ac) to generate the microwave.

　　How is the microwave oven cooking food? Alternating current (ac) can produce a high frequency electromagnetic wave, microwave. Water molecules have the positive and negative, so when the water for plus or minus alternate microwave energy, the water molecules will quickly turn. It is a little similar to the pins on the plane with a magnet suck the situation around. Microwave oven with alternating current produced by microwave, the water in the food molecules rotate at a speed of hundreds of millions of times per second, causing tremendous friction between molecules, rapid heating of food.

　　In fact, quality inspection institutions only care about whether there is a microwave microwave leakage. Amazingly, the quality inspection agencies have never questioned the microwave food itself is safe. Stage in 1991, owing to a lawsuit, people begin to realize that the microwave food is not one hundred percent safe. A man named Norma, walter's women's family to Sue her death by mistake.