|
gptkbp:instanceOf
|
crystalline ice phase
|
|
gptkbp:chemicalFormula
|
gptkb:H2O
|
|
gptkbp:commonName
|
ordinary ice
|
|
gptkbp:crystalSystem
|
hexagonal
|
|
gptkbp:density
|
0.917 g/cm³
|
|
gptkbp:discoveredBy
|
gptkb:Gustav_Tammann
|
|
gptkbp:discoveredIn
|
1900
|
|
gptkbp:formsFrost
|
true
|
|
gptkbp:formsGlaciers
|
true
|
|
gptkbp:formsHail
|
true
|
|
gptkbp:formsIcebergs
|
true
|
|
gptkbp:formsIceCubes
|
true
|
|
gptkbp:formsIceSheets
|
true
|
|
gptkbp:formsIcicles
|
true
|
|
gptkbp:formsSeaIce
|
true
|
|
gptkbp:formsSnowflakes
|
true
|
|
gptkbp:foundIn
|
comets
polar regions
mountain glaciers
atmosphere (as snow)
outer solar system bodies
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Ice Ih
|
|
gptkbp:hydrogenBondAngle
|
~109.5°
|
|
gptkbp:hydrogenBonding
|
yes
|
|
gptkbp:hydrogenDisorder
|
true
|
|
gptkbp:isotopeEffect
|
D2O ice is denser
D2O ice melts at higher temperature
|
|
gptkbp:isotopicVariants
|
D2O (heavy ice)
|
|
gptkbp:latticeConstants
|
a = 4.52 Å, c = 7.36 Å
|
|
gptkbp:meltingPoint
|
0 °C
|
|
gptkbp:molecularArrangement
|
tetrahedral
|
|
gptkbp:mostCommonIcePhase
|
true
|
|
gptkbp:naturalOccurrence
|
gptkb:Earth
gptkb:Mars
|
|
gptkbp:oxygenAtomArrangement
|
hexagonal close-packed
|
|
gptkbp:oxygenOxygenDistance
|
2.76 Å
|
|
gptkbp:phaseTransition
|
gptkb:Ice_II
gptkb:Ice_XI
water vapor
liquid water
|
|
gptkbp:protonDisorder
|
yes
|
|
gptkbp:protonOrderTransition
|
to Ice XI at low temperature
|
|
gptkbp:refractiveIndex
|
1.31
|
|
gptkbp:soundSpeed
|
~3,800 m/s
|
|
gptkbp:spaceGroup
|
P6₃/mmc
|
|
gptkbp:stabilityPressureRange
|
0–0.2 GPa
|
|
gptkbp:stabilityTemperatureRange
|
0–273 K
|
|
gptkbp:structureType
|
hexagonal lattice
|
|
gptkbp:thermalConductivity
|
2.22 W/(m·K) at 0°C
|
|
gptkbp:thermalExpansion
|
negative below -80°C
|
|
gptkbp:bfsParent
|
gptkb:Ice_I
gptkb:Ice_II
gptkb:Ice_III
gptkb:Ice_XII
|
|
gptkbp:bfsLayer
|
6
|