Physicochemical properties of nitrogen (N2)

Physicochemical Properties of Nitrogen (N2) 1. At room temperature and pressure, nitrogen is a colorless, odorless, and inert gas. Nitrogen accounts for approximately 78.1% of the air. Liquid nitrogen is also colorless and odorless, lighter than water, and does not burn in air. It is inert at room temperature but reacts with cyanides to synthesize ammonia under high temperature and pressure with a catalyst. 2. Active nitrogen can be obtained by decompression discharge. At high temperatures, it reacts with metals to form nitrides (such as Mg3N2, Cu3N2). At 1000℃, it reacts with calcium carbide to generate calcium cyanamide. 3. Slightly soluble in water, alcohol, and ether.

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2018-11-05

Physicochemical properties of nitrogen (N2)

Physicochemical Properties of Nitrogen (N2)`nbsp_tag

1. At normal temperature and pressure, nitrogen is a colorless, odorless, and tasteless inert gas. Nitrogen accounts for approximately 78.1% of the air. Liquid nitrogen is also colorless and odorless, lighter than water, and does not burn in air. It is inert at room temperature but reacts with cyanides to synthesize ammonia under high temperature and pressure with a catalyst.

2. Active nitrogen can be obtained by reduced-pressure discharge. At high temperatures, it reacts with metals to form nitrides (Mg3N2, Cu3N2, etc.). At 1000℃, it reacts with calcium carbide to produce calcium cyanamide.

3. Slightly soluble in water, alcohol, and ether.

4. The molecular weight of nitrogen is 28.0134, the melting point (triple point, 12.53 kPa) is -210.0℃, the liquid density (-210.0℃, 12.534 kPa)  is 869.5 kg/m³, and the thermal conductivity (100 kPa, 280 K) is 0.02447 W/(m·K).

5. Nitrogen itself is non-toxic and non-irritating. Inhaled nitrogen is excreted unchanged through the respiratory tract.

6. Safety Precautions. Nitrogen gas should be stored in pressure cylinders, and liquid nitrogen should be stored and transported in insulated containers and tank trucks. Nitrogen is non-corrosive. At room temperature, common metals such as carbon steel, stainless steel, copper, copper alloys, and aluminum, as well as ordinary plastic materials, can be used as container materials; for liquid nitrogen, nickel steel (90% Ni), stainless steel, copper, brass, and cupro-nickel can be used. At low temperatures, polytetrafluoroethylene and polytrifluorochloroethylene polymers can be used. In case of fire, nitrogen can be used for fire extinguishing. Nitrogen gas can be released into the atmosphere.

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