PRODUCT Properties
| Melting point: | -189.2 °C(lit.) |
| Boiling point: | -185.7 °C(lit.) |
| Density | 1.784（0℃） |
| vapor density | 1.38 (21 °C, vs air) |
| solubility | slightly soluble in H2O |
| form | colorless gas |
| color | colorless |
| Water Solubility | 33.6mL/1000g H2O (20°C) [KIR78]; Henry’s law constants, k×10?4: 3.974 (25.0°C), 5.359 (65.1°C), 5.342 (91.1°C), 3.812 (222.7°C), 2.541 (267.3°C), 1.870 (287.9°C) [POT78] |
| Merck | 13,788 |
| Dielectric constant | 1.5（-191℃） |
| Stability: | Stable. Inert. |
| LogP | 0.740 (est) |
| CAS DataBase Reference | 7440-37-1(CAS DataBase Reference) |
| NIST Chemistry Reference | Argon(7440-37-1) |
| EPA Substance Registry System | Argon (7440-37-1) |
Description and Uses
Argon belongs to the family of inert, rare gases of the atmosphere. It is plentiful compared to the other rare atmospheric gases; I million ft3 (28 300 m3) of dry air contains 9340 ft3 (264 m3 ) of argon. Argon is colorless, odorless, tasteless, and nontoxic. It is extremely inert and forms no known chemical compounds. It is slightly soluble in water.
Argon is extensively used in filling incandescent and fluorescent lamps, and electronic tubes; as an inert gas shield for arc welding and cutting; as a blanket in the production of titanium, zirconium, and other reactive metals; to flush molten metals to eliminate porosity in castings; and to provide a protective shield for growing silicon and germanium crystals.
