Physical properties of oxygen
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Physical Properties of Oxygen1. Name: Oxygen
2. Chemical formula: O2
3. CAS registry number: 7784-44-7
4. Relative molecular mass: 31.9995
5. Melting point: 54.36 K, -218.79°C, -361.82°F
6. Boiling point at 101.325 kPa (1 atm): 90.17 K, -182.98°C, -297.36°F
7. Critical temperature: 154.58 K, -118.57°C, -181.43°F
8. Critical pressure: 5.04 mPa, 50.43 bar, 49.77 atm, 731.43 psia
9. Critical volume: 73.4 cm3/mol
10. Critical density: 0.436 g/cm3
11. Critical compressibility factor: 0.288
12. Eccentricity factor: 0.022
13. Liquid density at -140°C: 0.876/cm3
14. Liquid coefficient of thermal expansion at -140°C: 0.00954 per °C
15. Surface tension at -218°C: 22.5×10-3 N/m, 22.5 dyn/cm
16. Gas density at 101.325 kPa (atm) and 70°F (21.1°C): 1.325 kg/m3, 0.0827 lb/ft3
17. Gas relative density at 101.325 kPa (1 atm) and 70°F (air = 1): 1.105
18. Heat of vaporization at the boiling point: 210.63 kJ/kg, 90.57 BTU/lb
19. Heat of fusion at the melting point: 23.88 kJ/kg, 5.97 BTU/lb
20. Gas specific heat at constant pressure, at 25°C: 0.921 kJ/(kg•K), 0.22 BTU/(lb•R)
21. Gas specific heat at constant volume, at 25°C: 0.661 kJ/(kg•K), 0.158 BTU/(lb•R)
22. Ratio of specific heats of gas, cp/cv: 1.393
23. Liquid specific heat at -173°C: 1.729 kJ/(kg•K), 0.413 BTU/(lb•R)
24. Solid specific heat at -243°C: 0.894 kJ/(kg•K), 0.214 BTU/(lb•R)
25. Molar entropy of gas at 25°C: 205.04 J/(mol•K)
26. Molar entropy of formation of gas at 25°C: 0 J/(mol•K)
27. Molar enthalpy of formation of gas at 25°C: 0 kJ/mol
28. Molar Gibbs free energy of formation of gas at 25°C: 0 kJ/mol
29. Solubility parameter: 8.182 (J/cm3)0.5
30. Molar volume of liquid: 28.052 cm3/mol
31. Solubility in water at 25°C: 39.45×10-6 (ω)
32. Octanol-water partition coefficient, lgKow: ---
33. Henry’s law constant in water at 25°C: 4420.8 MPa/x, 43630.1 atm/(x)
34. Gas viscosity at 25°C: 201.74×10-7 Pa•s, 201.74 μP
35. Liquid viscosity at -130°C: 0.071 mPa•s, 0.071 cp
36. Gas thermal conductivity at 25°C: 0.02571 W/(m•K)
37. Liquid thermal conductivity at -150°C: 0.1206 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 ACGIH: ---
44. Permissible concentration value according to OSHA: ---
45. Recommended concentration value according to NIOSH: --- ---