Liquid Nitrogen (LN2)
Liquid Nitrogen (LN2) or Liquid Nitrogen is nitrogen in a liquid state at very low temperatures. This is produced by the industry by fractional distillation of liquid air.
Liquid Nitrogen (LN2) is a clear colorless liquid with a density of 0, 807 g / mL at the boiling point and dielectric constant of 1, 4 [dead link] liquid nitrogen is often referred to by its acronym, LN2 or "LIN" or "LN" and has Number of UN 1977.
At atmospheric pressure, the boiling point of liquid nitrogen at -196 ° C (77 K; -321 ° F) and a cryogenic liquid which can cause rapid freezing on contact with living tissue, which can cause frostbite. When precisely isolated from the surrounding heat, Liquid Nitrogen (LN2) can be stored and transported, for example in a thermos. Here, very low temperatures remain constant at 77 K by slow boiling liquid, resulting in the evolution of nitrogen gas. Depending on the size and design, the holding time of the flasks ranges from a few hours to several weeks.
Liquid Nitrogen (LN2) can easily be converted into a solid by placing it in a vacuum chamber pumped by a rotary vacuum pump Liquid Nitrogen (LN2) freezes at 63 K (-210 ° C; -346 ° F) .. Despite its reputation, liquid nitrogen efficiency As the coolant is limited by the fact that it boils immediately on contact with warm objects, wrapping objects in nitrogen gas isolation. This effect, known as the Leidenfrost effect, applies to liquids in contact with objects significantly hotter than their boiling point. Faster cooling can be obtained by plunging the object into a liquid and solid nitrogen slurry slurry rather than being a liquid nitrogen only.
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