Mini-geyser with Liquid Nitrogen
液氮小喷泉
 | Dropping a thick-walled straw into liquid nitrogen will produce a geyser effect. This shows a short straw placed into a film cannister filled with liquid nitrogen. Dropping a long straw into a dewar flask of liquid nitrogen can produce a geyser about 50 cm high.
将一根厚壁吸管放入液氮中会产生喷泉效应。这展示了将一根短吸管放入装有液氮的薄膜容器中的情况。将一根长吸管放入液氮的 Dewar 瓶中，可以产生约 50 厘米高的喷泉。 |
The room-temperature straw is very hot compared to the nitrogen's temperature of 77 K, so that the liquid nitrogen in the straw is quickly heated far above its boiling temperature. It is more-or-less the same phenomenon at the coffee percolator. The walls of the straw must be quite thick to be effective - a typical thin drinking straw does not have sufficient heat capacity to be effective. The straw section used here is actually a stiff plastic tube designed to be used to hold a balloon.
在室温下，这个吸管比氮气的温度（77 K）要高很多，因此吸管内的液氮很快被加热到远高于其沸点。这种现象在咖啡过滤器中也大致相同。吸管的壁必须相当厚才能有效——一根普通的薄饮管并不具备足够的热容量来实现这一效果。这里使用的吸管部分实际上是一个刚性塑料管，设计用于容纳气球。
More dramatic geysers can be produced by using longer plastic tubes in a vacuum flask of liquid nitrogen.
使用较长的塑料管可以在真空瓶中产生更为壮观的喷泉。
Temperature concepts
Liquid nitrogen
索引 温度概念 液氮
| HyperPhysics***** Thermodynamics
HyperPhysics ***** 热力学 | R Nave |
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