On the Internet and movies it is possible to see effective tricks, focuses, experiments with use of liquid nitrogen. The popularity of this substance is caused by availability, a possibility of long storage, safety. What represents liquid nitrogen and what it is interesting by?
Characteristic and properties of liquid nitrogen
As follows from the name, it is transparent liquid. Receiving 1 liter of liquid nitrogen requires about 700 liters of its gaseous analog. Temperature of storage is 200 wasps. For maintenance of so low temperature use the vessel of the Dewar which is under pressure. It represents an aluminum thermos between which walls a vacuum. Liquid nitrogen can be stored in such vessel about a month.
At contact with air, liquid nitrogen evaporates and turns back into gas. Nitrogen in translation from Greek means "lifeless". In particular, liquid nitrogen has no color and a smell, it does not burn and does not react with other elements. Among other its properties it is possible to note resistance to explosions, non-toxicity that does production of liquid nitrogen safe. The main threat during the work with this substance – risk of a frostbite.
Use of liquid nitrogen
Liquid nitrogen finds application in various areas. For example, at fire fighting it replaces oxygen without which burning is simply impossible. Plus to everything the fire is extinguished without any damage of property, unlike the gulf by water or foam. Unfortunately, this method is very expensive.
In medicine there are several directions of use of liquid nitrogen. These are cosmetology procedures: removal of warts, papillomas, hems. The essence of a method is that there is an instant freezing and destruction of fabrics. In gynecology liquid nitrogen is used for cauterization of an erosion. Such way of treatment fast and painless.
Scientists work on a possibility of freezing of people and animals long ago. But so far it is only a plot of fantastic movies. The problem consists in the low speed of freezing that affects its uniformity. With such indicators it is impossible to keep and restore vital signs of an organism. Though presently there are already companies which are engaged in freezing of bodies of the dead. Their clients believe that in the future people will be learned to be restored to life, and they will have the second chance.
Produce liquid nitrogen at specialized stations. For this purpose compressors pump air from the environment. Cool it up to the oxygen liquefaction temperature, then merge the formed liquid. Further cooling try to obtain receiving already liquid nitrogen. The ready-made product spreads in vessels of the Dewar and is offered to consumers.
Experiments with liquid nitrogen spectacular, interesting, unusual. Therefore it is often bought also for house use. The main thing to be careful not to burn extremely low temperatures. Interest in science and knowledge will help you to open new properties of substances, to broaden horizons, to strike surrounding with effective tricks.