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Nitrogen (N2) constitutes 78.03% of the air, has a gaseous specific gravity of 0.967, and has a boiling point of -320.5 deg. F (-195.8°C) at atmospheric pressure. It is colorless, odorless, and tasteless. Nitrogen is often used as an "inert" gas due to its nonreactive nature with many materials. Common uses of gaseous nitrogen are found in electrical systems, chemical manufacturing, purging, and air-powered tools. Liquid nitrogen, produced by the cryogenic air separation process, finds wide use as a refrigerant gas in applications such as cryogenic grinding of plastics and food packaging.
Commercial nitrogen is produced by a variety of air separation processes, including cryogenic liquefaction and distillation, pressure swing adsorption (PSA), and membrane separation.
Nitrogen can react to form certain compounds under the influence of chemicals, catalysts, or high temperature; therefore it is not used as a shielding gas in the welding industry.
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| DOT Name: |
Nitrogen |
| DOT Hazard Class: |
Nonflammable Gas |
| DOT Label: |
Nonflammable Gas |
| DOT ID No.: |
UN1066 |
| CAS No.: |
7727-37-9 |
| Valve Outlet: |
CGA580 |
| Physical State in Cylinder: |
Gas |
| Major Hazards: |
High Pressure, Suffocation |
| Fire Potential |
Non-flammable |
| Formula: |
N2 |
| Molecular Weight: |
28.013 lb/mol |
| Specific Volume at 70 degrees F and 1 atm: 13.8 ft3/lb (12.00 m3/kg) |
| Specific Heat: 6.97 BTU/lbmol-deg F at 70 deg. F |
| Specific Gravity: |
.967 |
| Gas Density: |
0.07247 lb/ ft3 at 70 deg. F 14.7 PSIA |
| Boiling Point: |
Temperature: -320.5 deg. F (-195.8 deg. C)
Liquid Density: 50.50 lb./ft3
Latent Heat: 85.5 BTU/lb.
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| Critical Point: |
Temperature: -232.4 deg. F
Pressure: 492.9 PSIA
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| Melting Point: |
Temperature: -346.0 deg. F
Pressure: 1.82 PSIA
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