Definition of Liquid Nitrogen
The liquid nitrogen is pure nitrogen liquid at a temperature at or below its boiling point, which is -195.8 ° C at a pressure of one atmosphere.
This is colorless and odorless. Its density at the triple point is 0.807 g / ml.
It is produced industrially in significant quantities by fractional distillation of liquid air.
When handling, it recommends reading the HDSP (product safety sheet).
It is an inert gas (displaces oxygen ), and due to its low temperature, it can cause burns.
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Uses of Liquid Nitrogen
The uses are extensive and varied.
Use as a cryogenic agent to freeze blood and tissue samples, to destroy diseased tissue in dermatology, to preserve and transfer samples, in restoration.
- As a cooler for extreme overclocking practices.
- As coolants for CCD astronomy cameras.
- To store sample cells in a laboratory.
- As a source of dry nitrogen.
- For freezing and transporting food.
- For the preservation of blood, sperm, ovaries, or other kinds of tissue samples.
- To freeze the water in the pipes in the absence of a shut-off valve.
- For the promotion of corpses.
- In food preparation, like making ice cream.
- To preserve tissue samples from surgical excisions for future studies.
Liquid Nitrogen Tank
It is easy to transport and compact source of nitrogen gas without pressurization.
Additionally, its ability to maintain temperatures well below the freezing point of water makes.
It very useful in a wide range of applications, primarily as an open-loop refrigerant cycle, including:
This uses to seal waterways in the construction of tunnels underwater or groundwater level, applying lances inside the fissures through which water penetrates.
It thus plugging the pathway and giving time to apply glues or other sealing materials.
It is also used in the conservation of biological samples, to ensure rapid freezing to prevent damage to structures.
Application of Liquid Nitrogen
Aeronautics Sector
The uses of liquid nitrogen in this sector are extensive, from the application in wind tunnels.
This sector is very lightweight and resistant materials to heat treatment furnaces.
Healthcare Sector
This agent to freeze blood, tissue, and other biological samples.
Due to rapid freezing, it prevents damage to structures.
Thanks to its multiple properties, it also serves to destroy diseased tissue in dermatology.
These samples transfer in veterinary medicine, infertility centers, etc.
It is also an essential component in the pharmaceutical industry for the conservation of biological samples.
To protect them from the processes of humidity, oxidation, and contamination.
It also uses for egg freezing and shipping.
Automotive Sector
In the case of the automotive sector, liquid nitrogen is a vital component not only for the manufacture of cars.
It uses parts, frames, and other components of the automotive.
The fact that it is a perfect material to produce welds, if not also for our safety since it is a component in airbags.
Food Sector
The use of liquid nitrogen in this sector can transfer to other industries.
It uses for refrigeration and freezing of food.
Liquid nitrogen reaches freezing temperatures making it the fastest method of individual food freezing.
Metal Sector
Nitrogen prevents oxidation in the metal industry.
It is a crucial component of entrainment gas and purges in steel production.
Welding And Cutting Sector
We have already discussed the uses of liquid nitrogen to produce welds. So making it a necessary material in this sector.
On the other hand, as a purging gas, it is used in the welding of stainless steel tubes. Also as an auxiliary gas for laser cutting.
A Sector Of The Restoration
It is a component widely used in haute cuisine or avant-garde cuisine. Besides, liquid nitrogen accelerates cooking and eliminates bacterial processes.
So a technique widely used in the kitchen is cold cooking by introducing the food in liquid nitrogen. But
they end up with a cold and crisp exterior, and the interior is around 50ºC, resulting in a unique cold-heat sensation.
Danger Of Manipulation
The volumetric expansion rate is 1: 694, a large amount of repulsive force or positive pressure that can generate if the nitrogen evaporates suddenly.
The decompression devices on liquid nitrogen tanks seal with bronze plugs.
As a result, the tank burst. So the repulsion force was such that it propelled the tank through the ceiling of the room.
Also due to its icy temperature, touching it directly for even a second could inevitably cause cold, severe burns.
However, submerging a body limb in a tank with liquid nitrogen can cause instant solidification and detachment of the submerged limb.
It removed for consuming a reduced volume of liquid nitrogen in a cold cocktail.
Nitrogen is odorless, colorless, and tasteless, and makes up 78% of the air.
Also, it could cause suffocation without any prior warning or sensation. So containers containing liquid nitrogen can condense oxygen from the air.
The liquid in the container becomes increasingly rich in oxygen (90 K boiling point) as the nitrogen evaporates, and can cause violent oxidation of organic material.
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