Liquid Nitrogen

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(for storing laboratory samples at a temperature of about -150 Celsius)., as these students are doing.Liquid nitrogen (liquid density at the triple point is 0.807 g/mL) is the liquid produced industrially in large quantities by fractional distillation of liquid air and is often referred to by the abbreviation, LN2. It is pure nitrogen, in a liquid state.

Liquid nitrogen is a cryogenics fluid which is potentially capable of causing instant frostbite on contact with living tissue. When appropriately Thermal insulation from ambient heat, liquid nitrogen can be stored and transported without significant evaporative losses.

Applications Liquid nitrogen is a compact and readily transported source of nitrogen gas without pressurization. Further, its ability to maintain temperatures far below the freezing point of water (it boils at 77 Kelvin, −196 °Celsius, −320 °Fahrenheit) makes it extremely useful in a wide range of applications, primarily as an open-cycle refrigerant, including:

in the study of cryogenics
the immersion freezing and transportation of food products
the cryopreservation of blood, reproductive cells (sperm and Ovum), and other biology samples and materials
the cryonics in the hope of future reanimation.
as a coolant for highly sensitive sensors and low-noise amplifiers
as a cooling supplement for overclocking a central processing unit, a graphics processing unit, or another type of computer hardware
as a cooling medium during machining of high strength materials.
as a method of freezing water pipes in order to work on them in situations where a tap is not available to block water flow to the work area.

In dermatology, liquid nitrogen is used for removing unsightly or potentially skin cancer such as warts and actinic keratosis. It is also used in the process of promession, a way to dispose of the dead. Liquid nitrogen may be used as the working fluid in a binary engine.

Safety Since the liquid to gas expansion ratio of this substance is 1:694, a tremendous amount of force can be generated when liquid nitrogen boils off for whatever reasons. In a well-known accident in 2006 at Texas A&M University, the pressure-relief devices of a tank of liquid nitrogen were sealed with brass plugs. As a result, the tank failed catastrophically, and exploded. The force of the explosion was sufficient to propel the tank through the floor/ceiling immediately above it.

See also

Computer cooling
Liquid nitrogen economy

References

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Liquid nitrogen - Wikipedia, the free encyclopedia
Liquid nitrogen (liquid density at the triple point is 0.707 g/mL) is the liquid produced industrially in large quantities by fractional distillation of liquid air and is often ...

Nitrogen - Wikipedia, the free encyclopedia
Nitrogen (pronounced /nī'trə-jən/) is a chemical element that has the symbol N and atomic number 7 and atomic weight 14.007. Elemental nitrogen is a colorless, odorless ...

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Liquid Nitrogen
Harvard DEAS Safety Information ... Most of what appears below was taken from the Air Products ’ website (http://www.airproducts.com/) with its permission.

Liquid Nitrogen
LIQUID NITROGEN is fluid which is very cold. It's great fun! - and also useful - but the fun is what's really notable! ... LIQUID NITROGEN is the neutral stuff which 80% of the air ...

Liquid Nitrogen
Liquid Nitrogen Liquid nitrogen also comes in the form of a clear solution and can be stored on farm in static or wheeled tanks. There are a number of different types of ...

Air Products PLC — Liquid & Bulkgases — Liquid Nitrogen
Air Products is a worldwide supplier of industrial gases and equipment, specialty and intermediate chemicals, and environmental and energy systems.

Liquid Nitrogen
Before using Liquid Nitrogen read through this Code of Practice and local risk assessment and ensure that you understand the instructions – if in doubt do not proceed.