Nitrogensolution , 5ng/ml , 7727-37-9
CAS NO.：7727-37-9
Empirical Formula: N2
Molecular Weight: 28.01
MDL number: MFCD00011416
EINECS: 231-783-9
PRODUCT Properties
| Melting point: | −210 °C(lit.) |
| Boiling point: | −196 °C(lit.) |
| Density | 1.2506 |
| vapor density | 0.97 (vs air) |
| solubility | At 20 °C and at a pressure of 101 kPa, 1 volume dissolves in about 62 volumes of water and about 10 volumes of ethanol (96 per cent). |
| form | colorless gas |
| color | colorless |
| Odor | odorless, tasteless |
| Water Solubility | slightly soluble H2O; insoluble alcohol [HAW93] |
| Merck | 13,6634 |
| Dielectric constant | 1.0（20℃） |
Description and Uses
Nitrogen makes up the major portion of the atmosphere (78.08 percent by volume, 75.5 percent by weight). It is a colorless, odorless, tasteless, nontoxic, almost totally inert gas, and is colorless as a liquid. Nitrogen is nonflammable, will not support combustion, and is not life supporting. It combines with some of the more active metals such as lithium and magnesium to form nitrides, and at high temperatures it will also combine with hydrogen, oxygen, and other elements. It is used as an inert protection against atmospheric contamination in many nonwelding applications. Nitrogen is only slightly soluble in water and most other liquids, and is a poor conductor of heat and electricity. As a liquid at cryogenic temperatures it is nonmagnetic. It is shipped as a nonliquefied gas at pressures of 2000 psig (13 790 kPa) or above, and also as a cryogenic fluid at pressures and temperatures below 200 psig (1380 kPa) and -261°F (-163°C).
Nitrogen serves the important function of diluent in the earth’s atmosphere, controlling natural burning and respiration rates that otherwise would proceed much faster with higher concentrations of oxygen. Nitrogen is an important ingredient of numerous inorganic and organic compounds, including alkaloids, amides, amines, cyanides, cyanogens, diazo compounds, hydrazines, imides, nitrates, nitrides, nitrites, nitriles, oximes, purines, pyridines, and ureas. In terms of high-tonnage production, the nitrogen compound NH3 (ammonia) ranks first with worldwide production exceeding 50 million tons annually.
