Constituent
Name
Crystalline H2O ice
Family
molecular solid
Class
hydrogen bonded molecular solid
Compound type
inorganic molecular solid
Relevance
main - major
Arrangement
single phase
Mass fraction
1.0
Mole fraction
1.0
Formula
$H_2O$
Chemical formula
H2O
Elemental formula
H2 O
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$H_2O$ Water molecule 1 1.0 1.0 pure main
Chemical functions
  Function Number
$R-OH$ 2
Chemical bonds
  Bond Number
$-O \dots H-$ 4
$-O-H$ 2
Oxides
Formula $H_{2}O$
Mass fraction (%) 1.0
Class
molecular solids with hydrogen bonded molecules (03)
Type
homomolecular H-bonded solids (03.01)
Phase name
H2O Ih
Phase type
crystalline
Crystal system
hexagonal
Crystal class
dihexagonal-dipyramidal
Crystal class symbol
6/mmm (D6h)
Crystal spacegroup
P6(3)/mmc
Molar mass
18.0153 $g/mol$
Density
0.917 (273 K) - 0.928 (90 K) $g/cm^3$
Refringence type
uniaxial
Refringence sign
unknown
Birefringence
0.01
Refraction index $n_{\alpha}$
1.31
Refraction index $n_{\beta}$
1.33
Color
light blue (when thick)
Diaphaneity
transparent
Luster
vitreous