Basic Information About Liquid Nitrogen and Liquid Nitrogen Dewar

Harold K. Lively

Many people do not know much about nitrogen and liquid nitrogen, but most people must heard the breaking news of a young British girl loses her stomach after drinking liquid nitrogen cocktails. Liquid nitrogen used to be only limited in labs and industry fields, but today it got more and popular with some food and recipe applications. Young people love to try fresh things and liquid nitrogen cocktails are welcomed in wine bars. However, directly drinking or touch liquid nitrogen can be harmful to your healthy as since it is dangerously cold. Some people even insists that there should be a law to ban liquid nitrogen cocktails. This suggestion may be not advisable, but we must know something about it before we deal with it, in case of any body damages. Nitrogen makes up about 78.03% of the air we breath on earth and is often used as an inert gas because of its nonreactive nature with many materials. While liquid nitrogen or LN is pure N2 that has been cooled to the point that it changes from a gas to a liquid. LN is extremely cold – the element turns into a gas at temperatures above -321 degrees Fahrenheit – and has a variety of medical and culinary uses due to its ability to flash-freeze almost anything. One thing we must bear in mind is that LN does not have any health risks or dangers if it is properly handled. We need to know how to handle LN and how to storage it if we are going to do things related to liquid nitrogen. Due to the special low temperature property, LN is usually stored in a specially made container called cryogenic container or liquid nitrogen Dewar Unlike other gas storage cylinders, LN Dewar seldom have any pressure, since liquid nitrogen is always freezing cold. Such cryogenic Dewars usually are of 3-50 Liters, very convenient to carry from place to place, and there also exist some great volume LN Dewars for lab and industry use. The price for LN Dewar ranges from $300 to thousands of dollars with different volumes. So how to select a reasonable cryogenic container? Here is a general rule that the bigger and better insulated your lcryogenic container, the longer you can store them. Large Dewars for more than 50L capacity of LN Dewar are more efficient in LN storage, but the defect is that they are often too expensive,and they are mostly used in labs and industries. Smaller Dewars are much more convenient to transport and much cheaper, but larger Dewars are more efficient in storage and economical in long-term use.

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