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. |
| Cosmetics Ingredients Functions | ANTIOXIDANT |
| 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.
Gas as shield in gas metal-arc welding, in metal processing; carrier in gas-liquid and gas-solid chromatography; gas filler for incandescent light bulbs. Gas in fluorescent tubes analogous to neon lights, but produces a blue-purplish light; in rectifier tubes; in thermometers above mercury; in lasers; wherever an inert atmosphere is desired and the much cheaper nitrogen cannot be used; in ionization chambers and particle counters; in mixtures with He and Ne in Geiger counters; in argon-oxygen-decarburizing process for stainless steel; in manufacture of semiconducting devices; in gas mixtures as the working fluid in plasma arc devices. Liquid as cryogen to produce low temperetures. The isotope 40Ar is always found in minerals contg potassium, since it is a product of 40K decay; measuring the amount of 40Ar and 40K can be used for determining the geologic age of minerals and meteors.
