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welcome to the nist webbook jump to content national institute of standards and technology nist chemistry webbook srd 69 home search name formula iupac identifier cas number more options nist data srd program science data portal office of data and informatics about faq credits more documentation welcome to the nist chemistry webbook the nist chemistry webbook provides access to data compiled and distributed by nist under the standard reference data program the nist chemistry webbook contains thermochemical data for over 7000 organic and small inorganic compounds enthalpy of formation enthalpy of combustion heat capacity entropy phase transition enthalpies and temperatures vapor pressure reaction thermochemistry data for over 8000 reactions enthalpy of reaction free energy of reaction ir spectra for over 16 000 compounds mass spectra for over 33 000 compounds uv vis spectra for over 1600 compounds gas chromatography data for over 27 000 compounds electronic and vibrational spectra for over 5000 compounds constants of diatomic molecules spectroscopic data for over 600 compounds ion energetics data for over 16 000 compounds ionization energy appearance energy electron affinity proton affinity gas basicity cluster ion binding energies thermophysical property data for 74 fluids density specific volume heat capacity at constant pressure c p heat capacity at constant volume c v enthalpy internal energy entropy viscosity thermal conductivity joule thomson coefficient surface tension saturation curve only sound speed you can search for data on specific compounds in the chemistry webbook based on name chemical formula cas registry number molecular weight chemical structure or selected ion energetics and spectral properties nist reserves the right to charge for access to this database in the future the national institute of standards and technology nist uses its best efforts to deliver a high quality copy of the database and to verify that the data contained therein have been selected on the basis of sound scientific judgment however nist makes no warranties to that effect and nist shall not be liable for any damage that may result from errors or omissions in the database click here to enter the nist chemistry webbook 2026 by the u s secretary of commerce on behalf of the united states of america all rights reserved copyright for nist standard reference data is governed by the standard reference data act site privacy accessibility privacy program copyrights note this site is covered by copyright vulnerability disclosure no fear act policy foia environmental policy scientific integrity information quality standards commerce gov science gov usa gov vote gov