- 積分
- 2066
- 最後登入
- 1970-1-1
- 閱讀權限
- 100
- 積分
- 2066
- 帖子
- 精華
升級
100%
|
撞牆壁 發表於 2012-3-31 03:11
雖然不是很懂
但看到了驚然的數字 6472
只碰到一點點其實還好
LN2本來就是液態氮.只是論壇沒辦法打下標不然你應該很容易看懂
http://en.wikipedia.org/wiki/Liquid_nitrogen
Liquid nitrogen is nitrogen in a liquid state at an extremely low temperature. It is produced industrially by fractional distillation of liquid air. Liquid nitrogen is a colourless clear liquid with density of 0.807 g/mL at its boiling point and a dielectric constant of 1.4.[dead link][1] Liquid nitrogen is often referred to by the abbreviation, LN2 or "LIN" or "LN" and has the UN number 1977.
At atmospheric pressure, liquid nitrogen boils at −196 °C (77 K; −321 °F) and is a cryogenic fluid which can cause rapid freezing on contact with living tissue, which may lead to frostbite. When appropriately insulated from ambient heat, liquid nitrogen can be stored and transported, for example in vacuum flasks. Here, the very low temperature is held constant at 77 K by slow boiling of the liquid, resulting in the evolution of nitrogen gas. Depending on the size and design, the holding time of vacuum flasks ranges from a few hours to a few weeks.
|
|