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Properties
Property Value
Common name water
IUPAC name oxidane
CAS number 7732-18-5
Molecular formula H2O
Molecular mass 18.0153 g/mol
Density 0.998 g/ml for liquid at 20 °C, 1 atm
Boiling point 373.15 K (100 °C) at 1 atm
Critical point 647 K (374 °C), 22.1 MPa
Melting point 273.15 K (0 °C)
Specific heat, cp 4.184 J/(g·K) for liquid at 20 °C
Heat of vaporization 2257 J/g for liquid at 100 °C
Heat of fusion 333.55 J/kg for solid (ice) at 0 °C
Viscosity 0.001 Pa·s for liquid at 20 °C
Refractive index 1.333 for liquid at 20 °C