Physical properties of argon
Thread Content
Physical Properties of Argon1. Name: Argon
2. Chemical formula: Ar
3. CAS registry number: 7440-37-14
4. Relative molecular mass: 39.9485
5. Melting point: 83.8 K, -189.35°C, -308.83°F
6. Boiling point at 101.325 kPa: 87.28 K, -185.87°C, -302.57°F
7. Critical temperature: 150.86 K, -122.29°C, -188.12°F
8. Critical pressure: 49.0 mPa, 48.98 bar, 48.34 atm, 710.4 psia
9. Critical volume: 74.59 cm³/mol
10. Critical density: 0.5356 g/cm³
11. Critical compressibility factor: 0.291
12. Eccentricity factor: 0.00013
13. Density of the liquid at -140°C: 1.028 g/cm³
14. Coefficient of thermal expansion of the liquid at -140°C: 0.01113 1/°C
15. Surface tension at -189°C: 13.4×10^-3 N/m, 13.4 dyn/cm
16. Gas density at 101.325 kPa (1 atm) and 70°F (21.1°C): 1.654 kg/m³, 0.1033 lb/ft³
17. Relative gas density at 101.325 kPa (1 atm) and 70°F (air = 1): 1.379
18. Heat of vaporization at the boiling point: 161.21 kj/kg, 69.32 BTU/lb
19. Heat of fusion at the melting point: 29.594 kj/kg, 12.72 BTU/lb
20. Specific heat at constant pressure of the gas at 25°C: 0.52 kj/(kg•K), 0.124 BTU/(lb•R)
21. Specific heat at constant volume of the gas at 25°C: 0.312 kj/(kg•K), 0.075 BTU/(lb•R)
22. Ratio of specific heats of the gas, cp/cv: 1.667
23. Specific heat of the liquid at -173°C: 1.146 kj/(kg•K), 0.274 BTU/(lb•R)
24. Specific heat of the solid at -203°C: 0.895 kj/(kg•K), 0.214 BTU/(lb•R)
25. Molar entropy of the gas at 25°C: 154.73 j/(mol•K)
26. Molar entropy of formation of the gas at 25°C: 0 j/(mol•K)
27. Molar enthalpy of formation of the gas at 25°C: 0 kj/mol
28. Molar Gibbs free energy of formation of the gas at 25°C: 0 kj/mol
29. Solubility parameter: 14.138 (j/cm³)0.5
30. Molar volume of the liquid: 28.586 cm³/mol
31. Solubility in water at 25°C: 54.13×10^-6 (ω)
32. Octanol-water partition coefficient, lgKow: ---
33. Henry’s law constant in water at 25°C: 4022.2 MPa/x, 39696.1 atm/(x)
34. Viscosity of the gas at 25°C: 224.42 ×10^-7 Pa•s, 224.42 μP
35. Viscosity of the liquid at -130°C: 0.054 mPa•s, 0.054 cp
36. Thermal conductivity of the gas at 25°C: 0.01795 W/(m•K)
37. Thermal conductivity of the liquid at -150°C: 0.088 W/(m•K)
38. Lower explosive limit in air: ---
39. Upper explosive limit in air: ---
40. Flash point: ---
41. Autoignition temperature: ---
42. Heat of combustion at 25°C (77°F) in gaseous state: ---
43. Threshold concentration according to the American Conference of Governmental Industrial Hygienists (ACGIH): ---
44. Permissible concentration value according to the Occupational Safety and Health Administration (OSHA): ---
45. Recommended concentration value according to the National Institute for Occupational Safety and Health (NIOSH): --- ---