Liquid Nitrogen

Topics: Nitrogen, Gas, Liquid nitrogen Pages: 2 (458 words) Published: October 28, 2011
Liquid Nitrogen

Liquid nitrogen is nitrogen in a liquid state at a very low temperature. Its chemical formula is N2.

Manufacturing of Liquid Nitrogen
Liquid nitrogen is made by cooling and compressing air straight from the atmosphere. The type used to produce large amounts of liquid nitrogen looks vastly different but really happens is that air squashed and cooled . When you squash it, air molecules are forced closer together. If you also cool it down the molecules can slow down enough to make weak bonds. When enough molecules start bonding together like this, droplets of liquid form. This process is called condensation. As a result, liquid nitrogen is made and manufactured.

Liquid Nitrogen Uses
There are many uses of liquid nitrogen like freezing and transport of food products. Cryopreservation of biological samples is another use. Moreover, it can be used as a coolant for superconductors, vacuum pumps, and other materials and equipment. In addition, Cryotherapy to remove skin abnormalities is another use of liquid nitrogen. Also, it is used in shielding materials from oxygen exposure and cooling materials for easier machining or fracturing.

Physical and Chemical Properties
At normal pressure, liquid nitrogen boils at 77 K (−195.8°C or −320.4°F).The liquid to gas expansion ratio of nitrogen is 1:694, which means liquid nitrogen boils to fill a volume with nitrogen gas very quickly.Nitrogen is non-toxic, odorless, and colorless. It is relatively inert. It is not flammable.Nitrogen gas is slightly lighter than air once it reaches room temperature. It is slightly soluble in water.

liquid nitrogen  is usually stored in a Dewar (essentially a thermos jug )with a loose fitting cap (to allow pressure to escape as the nitrogen evaporates rather than building up pressure and becoming a bomb).

Effects (Advantages and disadvantages)
Liquid nitrogen is a compact and readily transported source of nitrogen gas without pressurization. Further,...
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