Sources & References
DensityCalcs uses a source hierarchy so formulas, constants and property data can be traced to something stronger than “another calculator said so.”
Units and physical constants
NIST and BIPM are preferred for SI definitions, unit usage and internationally recognized constants.
Thermophysical properties
NIST Chemistry WebBook and other recognized property databases are preferred for temperature- and pressure-dependent fluid data when available.
Domain-specific standards
Examples include ASTM for foam testing, NMFTA for freight-density classification, AUA for PSA-density clinical context, USDA/NRCS for soils and NASA for astronomy/physics educational references.
Manufacturer and application data
Manufacturer data may be used when the question depends on a specific product or formulation. Such values are labeled as product-specific rather than universal material constants.
Competitor pages
Competitor tools are useful for feature research and user-intent analysis, but they are not treated as the primary scientific authority when a standards body or primary reference is available.
Sources & references
We prefer standards bodies, government/scientific agencies and primary technical references. Reference values can vary with conditions, grade, composition or measurement method.
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