The information contained here is for a range of readers, from science fair entrants to researchers. New features include expanded and updated tables on standard thermodynamic properties of chemical substances; nuclear spins, moments, and other data related to NMR spectroscopy; strengths of chemical bonds; electron affinities; atomic and molecular polarizabilities; dielectric constant of water and steam; vapor pressure of mercury; standard atomic weights, reflecting the IUPAC 2001 changes; properties of seawater; and global and atmospheric carbon dioxide trends. Also included is an added appendix listing other reliable sources of physical and chemical data. Edited by Lide (former director, standard reference data, National Institute of Standards and Technology).