{
  "name": "Ice Ih cell: computed lattice constants and the inputs behind them",
  "desc": "The four molecules per cell that follow from the structure type assumed for ice Ih, four hydrogen bonds per molecule from the literature, and the cell dimensions and oxygen spacing computed for this page from the IAPWS R10-06 density, the molar mass and the Avogadro constant under an ideal tetrahedral network.",
  "lic": "CC BY 4.0",
  "lic_url": "https://creativecommons.org/licenses/by/4.0/",
  "by": "Ants, Cells & Atoms",
  "url": "https://antscellsandatoms.com/molecules/water/",
  "from": [
    "IAPWS R10-06(2009) ice Ih equation of state",
    "PubChem PUG-View CID 962 molecular weight",
    "CODATA 2022 Avogadro constant",
    "Libbrecht 2019, Snow Crystals, arXiv 1910.06389 v2, section 2.2 (hydrogen bonds per molecule; measured lattice constants used to check the count per cell)"
  ],
  "how": "Compiled by Ants, Cells & Atoms from the data listed",
  "data_by": [
    "IAPWS R10-06(2009), Revised Release on the Equation of State 2006 for H2O Ice Ih, equations computed for this page 2026-10-24",
    "PubChem PUG-View, CID 962 (water) and CID 280 (carbon dioxide), identity and molecular weight, NCBI data, retrieved 2026-10-24",
    "CODATA 2022 recommended values, NIST SRD 121 (physics.nist.gov/constants), Avogadro constant, retrieved 2026-10-24",
    "Four hydrogen bonds per molecule, and lattice constants a = 0.452 nm and c = 0.736 nm measured near 0 °C (used only to check the four molecules per cell, computed for this page): Libbrecht KG 2019, Snow Crystals, monograph, arXiv 1910.06389 v2 (2021), https://arxiv.org/abs/1910.06389, section 2.2, retrieved 2026-10-24"
  ]
}