Microwaves With People’s Life.pdf

河北科技师范学院2006 届外文 Microwaves With People’s Life Excerpts from the book The Complete Microwave Service Handbook 1989-2006 by J.Carlton Gallawa 王振江 指导教师：邵丽君 （河北科技师范学院化学系应用化学 0201班） Microwaves are used to detect speeding cars, to send telephone and television communications, and to treat muscle soreness. Industry uses microwaves to dry and cure plywood, to cure rubber and resins,to raise bread and doughnuts, and to cook potato chips. But the most common consumer use of microwave energy is in microwave ovens. That use has soared in the past decade. The Food and Drug Administration (FDA) has regulated the manufacture of microwave ovens since 1971. On the basis of current knowledge about microwave radiation, the Agency believes that ovens that meet the FDA standard and are used according to the manufacturers instructions are safe for use. Microwaves are a form of electromagnetic radiation; that is, they are waves of electrical and magnetic energy moving together through space. Electromagnetic radiation ranges from the energetic x-rays to the [1] less energetic radio frequency waves used in broadcasting . Microwaves fall into the radio frequency band of electromagnetic radiation. 1 河北科技师范学院2006 届外文 Microwaves should not be confused with x-rays, which are more powerful. Microwaves have three characteristics that allow them to be used in cooking: they are reflected by metal; they pass through glass, paper, plastic, and similar materials; and they are absorbed by foods. 1 Cooking with Microwaves Microwaves are produced inside the oven by an electron tube called a magnetron. The microwaves bounce back and forth within the metal interior until the