久久亚洲国产成人影院-久久亚洲国产的中文-久久亚洲国产高清-久久亚洲国产精品-亚洲图片偷拍自拍-亚洲图色视频

您現在的位置: Language Tips> Easy English> Odd Question  
   
 





 
How does a helium balloon float?
[ 2006-03-01 08:25 ]

   
  Helium balloon
   
  How does a helium balloon float?
How does a helium balloon float?Helium is lighter than air and just as the heaviest things will tend to fall to the bottom, the lightest things will rise to the top.

Helium weighs 0.1785 grams per liter. Nitrogen, which makes up 80% of the air we breathe, weighs 1.2506 grams per liter.

Basically, if you were to fill a soda bottle with helium and another with air, the one filled with helium would weigh a gram less than the bottle with air. It doesn't sound like a lot, but that's usually why balloons are usually really big, the one-gram difference really adds up in large volumes. Helium balloons follow the same principle as you do when you float in the water; the law of buoyancy. If the water you displace weighs more than you do, you will float.

Helium isn't the lightest element, hydrogen, weighing a mere 0.08988 grams per liter, is.

Wondering why we don't use that instead of helium?

Well, hydrogen balloons used to be really popular, but it is extremely flammable. The slightest spark will set off a huge explosion.

Did you know?

Helium is a colorless, odorless, tasteless inert gasat room temperature and makes up about 0.0005% of the air we breathe.

Helium's principal source is natural gas wells where it is extracted from the crude natural gas stream and purified and that it can be stored and shipped either as a gas or a cryogenic liquid.

 

note:

 

 


liter
: 升
Nitrogen: 氮

 

 

 


buoyancy: 浮力

 

 

 

 

 

 

inert gas: 惰性氣體

 

 

cryogenic liquid: 低溫液體

中國日報網英語點津版權說明:凡注明來源為“中國日報網英語點津:XXX(署名)”的原創作品,除與中國日報網簽署英語點津內容授權協議的網站外,其他任何網站或單位未經允許不得非法盜鏈、轉載和使用,違者必究。如需使用,請與010-84883631聯系;凡本網注明“來源:XXX(非英語點津)”的作品,均轉載自其它媒體,目的在于傳播更多信息,其他媒體如需轉載,請與稿件來源方聯系,如產生任何問題與本網無關;本網所發布的歌曲、電影片段,版權歸原作者所有,僅供學習與研究,如果侵權,請提供版權證明,以便盡快刪除。
相關文章 Related Story
 
 
 
本頻道最新推薦
 
英六成情侶感情生活不如意
畢業生自認就業前途渺茫
“滔滔不絕”如何表達?
荷蘭花商培育出彩虹玫瑰 單支售價24.49磅
常見的“媽媽語錄”
翻吧推薦
 
論壇熱貼
 
關于工資的英語詞匯大全
關于職業裝的英語詞匯
余光中《尺素寸心》(節選)譯
中國譯協中譯英最新發布各類專業術語直譯
功夫熊貓經典臺詞雙語

 

主站蜘蛛池模板: fc2ppv在线播放| 国产精品国产三级国产an不卡 | 国产成人免费高清视频 | 99国产在线 | 久久草在线看 | 久久久久99精品成人片三人毛片 | 色片在线播放 | 国产成人爱片免费观看视频 | 国产精品一级视频 | 黄色影院在线 | 精品国产一区二区三区四区不 | 丰满寡妇一级毛片 | 国产成人精品免费视频大全五级 | 亚洲综合色自拍一区 | 国产精品久久久久久免费播放 | 亚洲图片视频在线 | 久久精品国产这里是免费 | 黄色三级在线播放 | 成人在线网站 | www日本高清| 亚洲美女在线观看 | 久久加勒比 | 精品国产品香蕉在线观看 | 亚洲国产日韩精品 | 一区二区三区免费观看 | 日本精品视频一视频高清 | 国产91精品一区二区视色 | 黄色福利站| 一本一本久久a久久精品综合麻豆 | 久久88香港三级 | 午夜影院黄色 | 国产亚洲精品九九久在线观看 | 欧美在线一级片 | 免费看香港一级毛片 | 蜜桃欧美性大片 | 日本亲子乱子伦视频 | 亚洲第一综合网站 | 制服丝袜怡红院 | 在线观看国产精品日本不卡网 | 美女一级毛片免费观看 | 国产三级精品在线观看 |