搜狐首页 - 新闻 - 体育 - 娱乐 - 财经 - IT - 汽车 - 房产 - 女人 - 短信 - 彩信 - 校友录 - 邮件 - 搜索 - BBS - 搜狗 
Sohu >> English home >> Language Tips >> Culture Bites
为什么卤素灯泡的使用寿命较长?
(China Daily) Updated:2005-08-05 13:38
为什么卤素灯泡的使用寿命较长?
 

  Why do halogen light bulbs last longer?

  Hot-burning "halogen bulbs" can last two or three times longer than regular bulbs because they are filled with chemically active halogen gases that preserve the filament.

  The filament of an ordinary light bulb burns out because atoms of tungsten evaporate from its surface, so that it becomes thinner and thinner until it breaks. The evaporated tungsten is deposited on the inside surface of the bulb, where it forms a dark deposit.

  The gas inside a halogen bulb combines with the tungsten atoms that condense on the glass, removing the deposit. When the combined molecules touch the hot filament, the tungsten is redeposited there, and the gas is released to do the same trick again.

  A halogen bulb is often 10 to 20 percent more efficient than an ordinary incandescent bulb of similar voltage, wattage, and life expectancy. Halogen bulbs may also have two to three times as long a lifetime as ordinary bulbs, sometimes also with an improvement in efficiency of up to 10 percent.

  note:

  halogen: 卤素

  filament: 灯丝

  tungsten: 钨

  molecule: 分子

  incandescent bulb: 白炽灯泡

  

搜狗(www.sogou.com)搜索:“卤素”,共找到 21,085 个相关网页.
Comment This | Font Size  Large     Medium    Small | Print This | Close
Related Stories
  • 何谓流星?(08/03 14:08)
  • 巧克力是怎么制成的?(08/01 13:36)
  • 为什么头发会有曲直之分?(07/29 13:43)
  • 我们为什么会流汗?(07/27 13:44)
  • 我们为什么会眨眼睛?(07/25 13:52)
  • 氦气球是怎样升上天空的?(07/22 13:34)
  • 毕业生为什么要穿长袍戴方帽?(07/20 13:31)
  • 人为什么要眨眼?(07/18 13:27)
  • 何谓数字电视?(07/15 13:56)


  • ChinaRen - 搜狐招聘 - 网站登录 - 帮助中心 - 设置首页 - 广告服务 - 联系方式 - 保护隐私权 - About SOHU - 公司介绍
    Copyright © 2005 Sohu.com Inc. All rights reserved. 搜狐公司 版权所有