Chemical Symbol: Ar
CAS Registry Number: 7440-37-1
DOT Classification: Nonflammable gas
DOT Label: Nonflammable gas
Transport Canada Classification: 2.2
UN Number: UN 1006 (compressed gas), UN 1951 (refrigerated
liquid)
U.S. Units
SI Units
Chemical formula
Ar
Ar
Molecular weight
39.95
39.95
Density of the gas at 70°F (21.1°C) and 1
atm
0.103 lb/ft3
1.650 kg/m3
Specific gravity of the gas at 70°F (21.1°C)
and
1 atm (air = 1)
1.38
1.38
Specific volume of the gas at 70°F (21.1°C)
and
1 atm
9.71 ft3/lb
0.606 m3/kg
Boiling point at 1 atm
-302.6°F
-185.9°C
Melting point at 1 atm
-308.6°F
-189.2°C
Critical temperature
-188.1°F
-122.3°C
Critical pressure
711.5 psia
4905 kPa abs
Critical density
33.44 lb/ft3
535.6 kg/m3
Triple point
-308.8°F at
9.99 psia
-199.3°C at
68.9 kPa abs
Latent heat of vaporization at
boiling point and 1 atm
69.8 Btu/lb
162.3 kJ/kg
Latent heat of fusion at triple
point
12.8 Btu/lb
29.6 kJ/kg
Specific heat of the gas at 70°F (21.1°C)
and 1 atm
Cp
0.125 Btu/(lb)(°F)
0.523 kJ/(kg)(°C)
Cv
0.075 Btu/(lb)(°F)
0.314 kJ/(kg)(°C)
Ratio of specific heats
1.67
1.67
Solubility in water, vol/vol at
32°F (0°C)
0.056
0.056
Density of the liquid at
boiling point and 1 atm
87.02 lb/ft3
1394 kg/m3
Weight of the liquid at boiling
point
11.63 lb/gal
1394.0 kg/m3
While this information is presented in good faith and
believed to be accurate, GTS-Welco does not guarantee
satisfactory results from reliance upon such information.
Nothing contained herein is to be construed as a warranty or
guarantee, express or implied, regarding the performance,
merchantability, fitness, or any other matter with respect
to the products or processes, nor as a recommendation to use
any product or process in conflict with any patent.
GTS-Welco reserves the right, without notice, to alter the
designs or specifications of the products or processes
described herein.
