读者王星星问:“用微波炉来加热食品,为什么省时、省电?”要回答这个问题,要从微波加热食品的原理谈起.食品中都含有水,虽说不同食品的含水量可以相差很多,但是从物理学观点来看,它们均含有大数量的水分子.水分子(H_2O)是由一个氧原子和两个氢原子构成的(九年级化学中将学到),水分子中的氧原子对氢原子中的电子有较强的吸引力,这 Readers Wang Xingxing asked: “to use microwave oven to heat food, why save time, save electricity? ” To answer this question, from the principle of microwave heating food .Food contains water, although the moisture content of different foods can be different Many, but from a physical point of view, they contain a large number of water molecules. Water molecule (H 2 O) is composed of an oxygen atom and two hydrogen atoms (to be learned in ninth grade chemistry) Oxygen atoms have a strong attraction for electrons in hydrogen atoms