Argon

CAS NO.：7440-37-1
Empirical Formula: Ar
Molecular Weight: 39.95
MDL number: MFCD00003431
EINECS: 231-147-0
SAFETY DATA SHEET (SDS)
Update Date: 2024-03-14 15:18:25

What is Argon?

Description

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.

The Uses of Argon

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.

Properties of Argon

Melting point:	-189.2 °C(lit.)
Boiling point:	-185.7 °C(lit.)
Density	1.784（0℃）
form	colorless gas
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]

Safety information for Argon

Signal word	Warning
Pictogram(s)	Gas Cylinder Compressed Gases GHS04
GHS Hazard Statements	H280:Gases under pressure
Precautionary Statement Codes	P410+P403:Protect from sunlight. Store in a well-ventilated place.