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Liqiud Nitrogen (LN / LN2 / LIN)

Due its extremely low boiling point, liquid nitrogen is used as a cold medium in cryogenics.

Besides, nitrogen takes away his vaporisation warmth from the chill property and holds this as long as cold, until it evaporated.

Compared with the liquid oxygen which boils with −183°C (90 K), the boiling point of LN is lower around other 13 K, it boils with -196°C (77 K) and brings aerial oxygen and other gases to the condensation which can be separated in this manner.
Also liquid nitrogen (density 807 g/l) is used to generate the superconductive state with high temperature supraconductors.
It is also used to storage biological and medical tests, ova and sperm, as well as the shock freezing of biological material.

In the construction industry liquid nitrogen is used for cooling concrete and freezing soil.

In the area of the material technology, liquid nitrogen is used to remove retained austenite in special hardened steels or to procreate artificial weathering of the materials by "deep-freezing".

LIN is also used for shrink-fittings, e.g. to shrink gearshafts that gearwheels which are put on will be hold by an interference fit on the shafts. This technique is called shrink fitting.

While recycling cables, the insulant becomes friable by cooling with liquid nitrogen and than can be beaten off by metal (aluminium or copper) easily.

Another area of application for liquid nitrogen is the cryosurgery, hereby for example, warts get "frozen up". In this case liquid nitrogen is sprayed on directly to the part of the skin to be treated.

Exciting show effects combined with interesting taste experiences – CRYOCooking.
Cooking with liquid nitrogen, at the moment, generates a trend in the international gourmet's scene.

In Germany, "nitrogen funeral" (green funeral) is still as far as possible experimentally.
As an alternative to the cremation, the corpse gets controlled frozen to -18°C and then is given in a bath of liquid nitrogen of -196°C.
As a result, the numb body becomes fragile like glass. Caused by sound waves and vibration, it disintegrates to a powdery substance. In a vacuum chamber the water evaporates, afterwards metal parts – for example, dental fillings – will be removed.
There are the following advantages: Now the mortal remains could be buried in a small, biodegradable coffin vessel. For the funeral a small grave of about 30-cm depth suffices, where oxygen and bacteria initiate the decomposition process. The rotting is already concluded within half a year. In comparison: a customary wooden coffin funeral happens at about 2 m depth; the decomposition process lasts several years.
The Swedish biologist Susanne Wiigh-Mäsak works on a pilot project with regard to this new funeral kind.

Nitrogen consumers get delivery of nitrogen often instead of in compressed gas bottles - liquid nitrogen in vaccum insulated vessels like a thermos bottle.
These containers are called dewars. Liquide nitrogen is filled also form vacuum insulated stand-cylinders or delivery trucks.
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