NIST

The NIST Chemistry WebBook provides access to chemical and physical property data for chemical species over the internet. Data come from collections maintained by the NIST Standard Reference Data Program and outside contributors. The system organizes data by chemical species, allows searching by various means, and displays data including thermochemical and thermophysical properties and optical, electronic and mass spectra.

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0 shouts Added Sep 23, 2026 webbook.nist.gov
webbook.nist.gov/chemistry/
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