National Institute of Standards and Technology
NIST Chemistry WebBook — thermophysical properties of water
Reference thermophysical property data for water and steam: density, viscosity, surface tension, specific heat capacity, enthalpy of vaporisation, and the phase boundaries including the triple point and critical point.
Rights
- Commercial reuse
- Yes
- Redistribution
- Not clearly stated
- Derivative use
- Yes
- Attribution required
- No
- Restrictions
- NIST Standard Reference Data may carry specific terms for bulk redistribution; individual property values are freely citable.
- Terms last checked
- 23 August 2026
Access and coverage
- Publisher
- National Institute of Standards and Technology
- Geographic coverage
- Not geographic — physical constants
- Update frequency
- static
- Formats
- html, csv
- Bulk download
- Available
- Registration required
- No
- Cost to Hydrionis
- Free
- Domains
- chemistry