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Compound records in PubChem include lists of various chemical and physical properties. PubChem is maintained by the National Center for Biotechnology Information (NCBI) of the National Library of Medicine.
ChemSpider records for chemical substances often include common properties such as melting point, boiling point, specific gravity, and solubility. ChemSpider is maintained as a free database by the Royal Society of Chemistry.
Chemical substance records may include selected physical properties, both predicted (or calculated) and experimental.
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