Properties of water

Water (H2O)
IUPAC name[hide] Water Oxidane
Other names[hide] Hydrogen oxide Dihydrogen monoxide (DHMO) Hydrogen monoxide Dihydrogen oxide Hydrogen hydroxide (HH or HOH) Hydric acid Hydrohydroxic acid Hydroxic acid Hydrol[1] μ-Oxido dihydrogen
Identifiers
CAS number	7732-18-5
PubChem	962
ChemSpider	937
UNII	059QF0KO0R
ChEBI	CHEBI:15377
ChEMBL	CHEMBL1098659
RTECS number	ZC0110000
Jmol-3D images	Image 1
SMILES [show]
InChI [show]
Properties
Molecular formula	H2O
Molar mass	18.01528(33) g/mol
Appearance	white solid or almost colorless, transparent, with a slight hint of blue, crystalline solid or liquid [2]
Density	1000 kg/m3, liquid (4 °C) (62.4 lb/cu. ft) 917 kg/m3, solid
Melting point	0 °C, 32 °F, 273.15 K[3]
Boiling point	99.98 °C, 211.97 °F, 373.13 K[3]
Acidity (pKa)	15.74 ~35–36
Basicity (pKb)	15.74
Refractive index (nD)	1.3330
Viscosity	0.001 Pa s at 20 °C
Structure
Crystal structure	Hexagonal
Molecular shape	Bent
Dipole moment	1.85 D
Hazards
Main hazards	Drowning (see also Dihydrogen monoxide hoax) Water intoxication
NFPA 704	0 0 0
Related compounds
Other cations	Hydrogen sulfide Hydrogen selenide Hydrogen telluride Hydrogen polonide Hydrogen peroxide
Related solvents	acetone methanol
Related compounds	water vapor ice heavy water
(verify) (what is: /?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references