Comprehensive units of measurement dataset — 3,028 units, 138 physical quantities, conversion factors, 11 measurement systems, with UO/OM/UCUM ontology annotations. JSONL + JSON Schema.
json-schema physics npm-package ontology open-data dataset unit-conversion si-units units-of-measurement metrology ucum jsonl pypi-package imperial-units conversion-factors
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Updated
Feb 12, 2026 - Python