{
  "name": "Sodium chloride: ions in a salt cube by two routes",
  "desc": "How many sodium and chloride ions a cube of salt 0.1, 0.3 or 1 mm on each edge holds, by two routes (counting unit cells; weighing with the density, molar mass and Avogadro constant), with the ratio of the two routes and two comparison sizes; one quantity per row.",
  "lic": "CC BY 4.0",
  "lic_url": "https://creativecommons.org/licenses/by/4.0/",
  "by": "Ants, Cells & Atoms",
  "url": "https://antscellsandatoms.com/molecules/sodium-chloride/",
  "from": [
    "cell edges of COD 2108652, 4300180, 4320809 via PubChem CID 5234; HSDB density; PubChem molar mass; CODATA 2022 Avogadro constant",
    "Li et al. 2023 (hair) and Velho Rodrigues et al. 2021 (Paramecium caudatum) for the comparison rows"
  ],
  "how": "Compiled by Ants, Cells & Atoms from the data listed",
  "data_by": [
    "Crystallography Open Database records 2108652 (Tsirelson V, Stash A 2020, Acta Cryst. B 76:769), 4300180 and 4320809 (Jürgens B, Irran E, Schneider J, Schnick W 2000, Inorg. Chem. 39:665), CC0, as listed in PubChem CID 5234, retrieved 2026-10-24",
    "Density 2.17 g/cm3 at 25 °C: Hazardous Substances Data Bank in PubChem CID 5234, citing the CRC Handbook of Chemistry and Physics, 94th ed.; molar mass 58.44 g/mol computed by PubChem, retrieved 2026-10-24",
    "Avogadro constant 6.02214076e23 per mole: CODATA 2022 recommended values, NIST, retrieved 2026-10-24",
    "Human hair, typically 50–100 µm: Li C et al. 2023, Journal of Biomedical Optics 28(11):116501, CC BY 4.0, https://doi.org/10.1117/1.JBO.28.11.116501, retrieved 2026-10-24",
    "Paramecium caudatum length 140–311 µm: Velho Rodrigues MF, Lisicki M, Lauga E 2021, PLOS ONE 16(6):e0252291, CC BY 4.0, https://doi.org/10.1371/journal.pone.0252291, retrieved 2026-10-24",
    "Counts, masses and ratios computed 2026-10-24"
  ]
}