来自：查字典高考网 2014-12-25
霓虹灯
A neon light is the sort of light you see used in advertising signs. These signs are made of long, narrow glass tubes, and these tubes are often bent into all sorts of shapes. The tube of a neon light can spell out a word, for example. These tubes emit light in different colors.
The idea behind a neon light is simple. Inside the glass tube there is a gas like neon, argon or krypton at low pressure. At both ends of the tube there are metal electrodes. When you apply a high voltage to the electrodes, the neon gas ionizes, and electrons flow through the gas. These electrons excite the neon atoms and cause them to emit light that we can see. Neon emits red light when energized in this way. Other gases emit other colors.
【托福(toefl)阅读考试知识(二十六)】相关文章：
[标签：海外留学,语言考试,托福,,]
沈阳音乐学院郎亦农教授的女高音高考曲目解析课程 第1集 沈阳音乐学院郎亦农为你讲解女高音高考曲目
葛军大爷怒了：高考我出了个小学数学送分题，你们跟我说不会做？
衍声高考琴行2019高本硕学生暑假音乐会 张俊瀚《陕北民歌主题变奏曲》《阿根廷舞曲》第三乐章
高考阅卷名师给考生的高考作文密训课 第3集 高考作文审题实操方法精讲（一）
学渣儿子高考，英语选择题全选B！老师通报成绩的那一刻父亲懵了
NBA流言收割机 第6集 神预测？高考数学试题暗示猛龙勇士4
张雪峰高考志愿填报指南 第15集 高考填报志愿，想学电子信息类专业，推荐报这六所高校，不出错
