Welcome to the NIST WebBook
The NIST Chemistry WebBook is a comprehensive resource for chemical and physical property data of chemical substances. It provides access to thermochemical, thermophysical, and ion energetics data compiled by NIST under the Standard Reference Data Program. The WebBook is widely used by researchers, educators, and professionals in the chemical and related sciences for reliable data.
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Citation Level
1996
English, etc
Website Key Features
Thermochemical Data
Includes data on enthalpy, entropy, heat capacity, and phase transition enthalpies for thousands of compounds.
Thermophysical Data
Provides viscosity, thermal conductivity, and other physical property data for a wide range of substances.
Ion Energetics Data
Contains ionization energies, electron affinities, and proton affinities for various species.
Spectroscopic Data
Offers IR spectra, mass spectra, and UV/Vis spectra for chemical identification and analysis.
Reaction Thermochemistry
Features data on reaction enthalpies and free energies for chemical reactions.
Phase Change Data
Includes melting points, boiling points, and critical properties for substances.
Search Functionality
Allows users to search for data by chemical name, formula, CAS registry number, or structure.
Interactive Tables
Provides interactive tables for easy data comparison and analysis.
Reference Citations
Includes citations to the original literature sources for the data provided.
User Guides
Offers detailed guides on how to use the WebBook and interpret the data.
Additional information
Data Sources
Data are compiled from the scientific literature and evaluated by NIST scientists for accuracy and reliability.
Update Frequency
The WebBook is updated periodically as new data become available and are evaluated.
Access
Free access to all data and features without the need for registration.
Usage Policy
Data may be used freely with appropriate attribution to NIST.
Contact Information
Provides contact details for feedback, questions, and data inquiries.
Related Resources
Links to other NIST resources and external databases for additional chemical data.
Technical Requirements
Compatible with most modern web browsers; no special software required.
Educational Use
Widely used in academic settings for teaching and research in chemistry and physics.
HTTP headers
Security headers report is a very important part of user data protection. Learn more about http headers for webbook.nist.gov