Section 0: Introduction
The Editor and Editorial Board
Preface
New Data and Updates in the 106th Edition
On the Evaluation of Chemistry and Physics Data
Current Contributors
Part 1 Data on Chemical Substances
Section 1: Elements and Their Isotopes
Introduction
The Elements: Properties
Standard Atomic Weights
Atomic Masses and Isotopic Abundances
Abundance of Elements in the Earth's Crust and in the Sea
Melting, Boiling, Triple, and Critical Points and Densities of the Elements
Heat Capacity of the Elements at 25 °C
Heat Capacity of Solid Elements as a Function of Temperature
Table of the Isotopes
Phase Transition Temperatures of the Solid Elements at Atmospheric Pressure
Crystal Structures and Lattice Parameters of Allotropes of the Elements
Density of Molten Elements as a Function of Temperature
Physical and Thermal Properties of Rare-Earth Metals
Thermal Properties of Pure Elemental Metals
Electrical Resistivity of Pure Elemental Metals
Electron Work Function of the Elements
Magnetic Susceptibility of the Elements
Optical Properties of The Elements
Electronegativity of the Elements
Index of Refraction of Liquid Elements
Vapor Pressure of the Metallic Elements - Equations
Vapor Pressure of the Metallic Elements - Data
Description and History of Elements
Section 2: Atomic Structure and Spectroscopy Data
Introduction
Electron Configuration and Ionization Energies of Neutral Atoms and Atomic Ions
Electron Affinities of the Atomic Elements
Persistent Lines of the Neutral Atomic Elements
Atomic Radii of the Elements
Polarizabilities of the Atomic Elements
Section 3: Properties of Organic Compounds
Introduction
Physical Constants of Organic Compounds
CAS Registry Number Index of Organic Compounds
Diamagnetic Susceptibility of Organic Compounds
Critical Constants of Organic Compounds
Dissociation Constants of Organic Acids and Bases
Miscibility of Organic Solvents
Dependence of Boiling Point of Organic Liquids on Pressure
Bond Lengths in Crystalline Organic Compounds
Bond Lengths in Organometallic Compounds
Perfluoro- and Polyfluoroalkyl Substances
Section 4: Properties of Inorganic Compounds
Introduction
Physical Constants of Inorganic Compounds
CAS Registry Number Index of Inorganic Compounds
Critical Constants of Inorganic Compounds
Permittivity (Dielectric Constant) of Inorganic Solids
Density of Molten Inorganic Salts as a Function of Temperature
Dissociation Constants of Inorganic Acids and Bases
Index of Refraction of Inorganic Liquids
Index of Refraction of Inorganic Crystals
Magnetic Susceptibility of Inorganic Compounds
Optical Properties of Inorganic Solids
Aqueous Solubility of Inorganic Compounds as a Function of Temperature
Solubility Product Constants of Inorganic Salts
Solubility Charts for Inorganic Salts
Properties of Gas Clathrate Hydrates
Physical and Optical Properties of Minerals
Crystallographic Data on Minerals
Section 5: Properties of Water
Introduction
Thermophysical Properties of Water and Steam
Fixed-Point Thermophysical Properties of H2O and D2O
Properties of Saturated Liquid D2O
Vapor Pressure and Other Saturation Properties of Water
Standard Density of Water as a Function of Temperature
Ionization Constant of Water as a Function of Temperature and Pressure
Ionization Constant of Normal and Heavy Water at Saturated Vapor Pressure
Electrical Conductivity of Water
Permittivity (Dielectric Constant) of Water as a Function of Frequency
Properties of Ice and Supercooled Water
Vapor Pressure of Ice
Solid-Liquid Phase Equilibria for Ice as a Function of Pressure
Index of Refraction of Water
Properties of Seawater
Solubility of Hydrocarbons in Seawater
Section 6: Properties of Polymers
Introduction
Abbreviations Used in Polymer Science and Technology
Physical Properties of Important Polymers
Polymer Solvents
Glass Transition Temperatures for Polymers
Permittivity of Polymers
Pressure-Volume-Temperature Relationships for Polymer Melts
Vapor Pressures (Solvent Activities) for Binary Polymer Solutions
Solubility Parameters of Polymers
Section 7: Properties of Bio-Medical Compounds and Substances
Introduction
Properties of Amino Acids
Structures of Common Amino Acids
Properties of Purine and Pyrimidine Bases
The Genetic Code
Properties of Fatty Acids and their Methyl Esters
Composition and Properties of Oils and Fats
Carbohydrate Names and Symbols
Standard Transformed Gibbs Energies of Formation for Biochemical Reactants
Apparent Equilibrium Constants for Enzyme-Catalyzed Reactions
Apparent Equilibrium Thermodynamics of Protein-Ligand Binding Reactions
Thermodynamic Quantities for the Ionization Reactions of Buffers in Water
Biological Buffers
pH Values of Biological Materials and Foods
Properties and Functions of Important Drugs
Properties of Controlled Substances
Section 8: Chemical Structure, Bonding, and Molecular Spectroscopy Data
Introduction
Structure of Free Molecules in the Gas Phase
Characteristic Bond Lengths in Free Molecules
Dipole Moments
Hindered Internal Rotation
Bond Dissociation Energies
Force Constants for Bond Stretching
Fundamental Vibrational Frequencies of Small Molecules
Spectroscopic Constants of Diatomic Molecules
Polarizabilities of Molecules
Ionization Energies of Gas-Phase Molecules
Electron Affinities of Molecules
Part 2 Data for the Practice of Chemistry and Physics
Section 9: Physical Chemistry Data
Introduction
CODATA Key Values for Thermodynamics
Standard Thermodynamic Properties of Chemical Substances
Thermodynamic Properties as a Function of Temperature
Thermodynamic Properties of Aqueous Ions
Proton Affinities
Heat of Combustion
Heat Capacity of Solids as a Function of Temperature
Transition Temperatures and Heats of Transition for Metal Oxyanion Salts
Electrical Conductivity of Aqueous Solutions
Molar Electrical Conductivity of Aqueous HF, HCl, HBr, and HI
Molar Electrical Conductivity of Electrolytes in Aqueous Solution
Ionic Conductivity and Diffusion at Infinite Dilution
Electrochemical Series
Meaning Activity Coefficients of Acids, Bases, and Salts as a Function of Concentration
Enthalpy of Dilution of Acids
Enthalpy of Solution of Electrolytes
Concentrative Properties of Aqueous Solutions
Ebullioscopic Constants for Calculation of Boiling Point Elevation
Cryoscopic Constants for Calculation of Freezing Point Depression
Freezing Point Lowering by Electrolytes in Aqueous Solution
Azeotropic Data for Binary Mixtures
Section 10: Environmental Chemistry Data
Introduction
Chemical Reaction Rate Constants for Atmospheric Studies
Properties of Refrigerants
Global Warming Potential of Greenhouse Gases
Annual Atmospheric Concentration of Carbon Dioxide and Methane
Aqueous Solubility and Henry's Law Constants of Organic Compounds
Octanol-Water Partition Coefficients
Global Temperature Trend, 1880-2024
Solar Irradiance at the Earth
Geographical and Seasonal Variations in Solar Radiation
Infrared Absorption by the Earth's Atmosphere
U.S. Standard Atmosphere (1976)
Section 11: Solid-State Chemistry and Physics Data
Introduction
Thermal Analysis for Materials Characterization
Microscopy Techniques for Materials Characterization
Symmetry of Crystals
Ionic Radii in Crystals
The Madelung Constant and Crystal Lattice Energy
Elastic Constants of Single Crystals
Polarizability of Atoms and Ions in Solids
Electrical Resistivity of Binary Alloys
Electrical Resistivity of Carbon Materials
Curie Temperature of Ferroelectric Crystals
Properties of Antiferroelectric Crystals
Properties of Superconductors
High-Temperature Superconductors
Organic Superconductors
Properties of Semiconductors
Properties of Semiconductor Solid Solutions
Properties of Organic Semiconductors
Diffusion Data for Semiconductors
Properties of Magnetic Materials
Organic Magnets
Thermal and Strength Properties of Materials at Cryogenic Temperatures
Thermoelectric Properties of Metals and Semiconductors
Thermal Conductivity of Metals and Semiconductors as a Function of Temperature
Fermi Energy and Related Properties of Metals
Secondary Electron Emission
Electron Inelastic Mean Free Paths
Electron Stopping Powers
Attenuation Coefficients for High-Energy Electromagnetic Radiation
Thermal Conductivity of Crystalline Dielectrics
Thermal Conductivity of Ceramics and Other Insulating Materials
Section 12: Industrial Chemistry Data
Introduction
Thermophysical Properties of Air
Thermophysical Properties of Fluids
Thermophysical Properties of Fluids at Saturation
Vapor Pressure of Compounds and Elements
Vapor Pressure of Fluids at Temperatures below 300 K
Vapor Pressure of Saturated Salt Solutions
Enthalpy of Vaporization
Enthalpy of Fusion
Virial Coefficients of Gases
Compressibility and Expansion Coefficients of Liquids
Temperature and Pressure Dependence of Liquid Density
Properties of Cryogenic Fluids
Properties of Liquid Helium
Properties of Ionic Liquids
Energy Content of Fuels
Surface Tension of Liquids
Surface Tension of Aqueous Mixtures
Surface Active Chemicals (Surfactants)
Permittivity (Dielectric Constant) of Liquids
Permittivity (Dielectric Constant) of Gases
Viscosity of Gases
Viscosity of Liquids
Thermal Conductivity of Gases and Refrigerants
Thermal Conductivity of Liquids
Influence of Pressure on Freezing Points
Sublimation Pressure of Solids
Solubility of Gases in Water as a Function of Temperature
Solubility of Carbon Dioxide in Water as a Function of Temperature and Pressure
Solubility of Organic Compounds in Pressurized Hot Water
Diffusion in Gases
Diffusion of Gases in Water
Diffusion Coefficients in Liquids at Infinite Dilution
Mean Free Path and Related Properties of Gases
Index of Refraction of Air
Index of Refraction of Gases
Index of Refraction of Liquids for Calibration Purposes
Section 13: Astrophysics, Earth Sciences, and Physics Data
Introduction
Astronomical Constants
Properties of the Solar System
Interstellar Molecules
Mass, Dimensions, and Other Parameters of the Earth
Density, Pressure, and Gravity as a Function of Depth within the Earth
Acceleration Due to Gravity
Ocean Pressure as a Function of Depth and Latitude
Summary Tables of Particle Properties
Blackbody Radiation
Classification of Electromagnetic Radiation
Coefficient of Friction
Part 3 Data for Modern Chemical Laboratories
Section 14: Analytical Chemistry Data
Introduction
Abbreviations and Symbols Used in Analytical Chemistry
Basic Instrumental Techniques of Analytical Chemistry
Analytical Standardization and Calibration
Figures of Merit
Mass- and Volume-Based Concentration Units
Detection of Outliers in Measurements
Properties of Carrier Gases for Gas Chromatography
Symbols Used in Gas and Liquid Chromatographic Schematic Diagrams
Stationary Phases for Porous-Layer Open Tubular Columns
Coolants for Cryotrapping
Properties of Cross-Linked Silicone Stationary Phases
Detectors for Gas Chromatography
Varieties of Hyphenated Gas Chromatography with Mass Spectrometry
Gas Chromatographic Retention Indices
Pressure Drop in Open Tubular Gas Chromatographic Columns
Phase Ratios for Capillary Columns
Minimum Recommended Injector Split Ratios for Capillary Columns
Eluotropic Values of Solvents on Octadecylsilane and Octylsilane
Solid-Phase Microextraction Sorbents
Instability of HPLC Solvents
Fluorescence Labeling Reagents Used Pre-Column in HPLC
Detectors for Liquid Chromatography
Solvents for Ultraviolet Spectrophotometry
Correlation Table for Ultraviolet Active Functionalities
Middle-Range Infrared Absorption Correlation Charts
Spurious Infrared Absorption Bands
Raman Band Frequencies
Nuclear Spins, Moments, and Other Data Related to NMR Spectroscopy
Properties of NMR Nuclei
Proton NMR Absorption of Major Chemical Families
Proton NMR Correlation Chart for Major Organic Functional Groups
Proton NMR Shifts of Organic Liquids
Proton Chemical Shifts of Contaminants in Deuterated Solvents
13C-NMR Absorptions of Major Functional Groups
13C-NMR Chemical Shifts of Organic Solvents
15N-NMR Chemical Shifts of Major Chemical Families
Natural Abundance of Isotopes Important in Mass Spectrometry
Mass Spectral Fragmentation Patterns of Organic Compound Families
Mass Spectral Fragments Lost
Reference Masses in the Spectrum of Heptacosafluorotributylamine (Perfluorotributylamine)
Mass Spectral Peaks of Organic Liquids
Spurious Signals Observed in Mass Spectrometers
Chlorine-Bromine Combination Isotope Intensities in Mass Spectral Patterns
Analyzing Crystals in X-Ray Spectrometers
K Absorption Edges and Characteristic Emission Lines of Atomic Elements
Radioisotope Sources for X-Ray Fluorescence Spectroscopy
Standards for Laboratory Weights
Reduction of Weighings in Air to in Vacuo
Indicators for Acids and Bases
Preparation of Special Analytical Reagents
Organic Analytical Reagents for the Determination of Inorganic Ions
Section 15: Chemical and Laboratory Safety Data
Introduction
Chemical Safety
Risk Assessment Methodology
Abbreviations Used in the Assessment and Presentation of Laboratory Hazards
Incompatible Chemicals
Water-Reactive Chemicals
Pyrophoric Compounds - Compounds That React with Air
Peroxide Testing
Explosion (Shock) Hazards
Flammable Liquids Categorization Criteria
Flammability of Solvents and Other Chemical Substances
Chemical Carcinogens
Radiation Safety and Protection
Annual Limits on Intakes of Radionuclides
Safety in the Use of Cryogens
Nanomaterial Safety Guidelines
Threshold Limits for Airborne Contaminants
Chemical Fume Hoods and Biological Safety Cabinets
Gas Cylinder Safety
Compressed Air Safety
Laser Hazards in the Laboratory
Magnetic Field Safety
Electrical Shock Hazards
Laboratory Glove Selection
Protective Clothing
Selection of Respirator Cartridges and Filters
Selection of Hearing Protection Devices
Types and Uses of Fire Extinguishers
Section 16: Practical Laboratory Data
Introduction
Laboratory Solvents and Other Liquid Reagents
Density of Solvents as a Function of Temperature
pH Scale for Aqueous Solutions
Buffer Solutions Giving Round Values of pH at 25 °C
Constant Humidity Solutions
Standard Salt Solutions for Humidity Calibration
Low-Temperature Baths for Maintaining Constant Temperature
Metals and Alloys with Low-Melting Temperature
Standard KCl Solutions for Calibrating Electrical Conductivity Cells
Characteristics of Particles and Particle Dispersoids
International Temperature Scale of 1990 (ITS-90)
Reference Points on the ITS-90 Temperature Scale
Standard ITS-90 Thermocouple Tables
Recommended Secondary Reference Points on the International Temperature Scale of 1990 (ITS-90)
Metal Carbide-Carbon Phase Transition Temperatures
Part 4 Reference Tables and Indices
Section 17: Units, Constants, and Conversion Factors
CODATA Recommended Values of the Fundamental Physical Constants: 2018
International System of Units (SI)
Expression of Uncertainty of Measurements
Descriptive Terms for Solubility
Units for Magnetic Properties
Conversion Factors for Energy Units
Conversion Factors for Pressure Units
Units of Measure for Vacuum Systems
Values of the Gas Constant in Different Unit Systems
Conversion Factors for Thermal Conductivity Units
Thermodynamic Functions and Relations
Section 18: Nomenclature, Terminology, and Symbols
Nomenclature for Chemical Compounds
Representation of Chemical Structures with the IUPAC International Chemical Identifier (InChI)
Definition of Ambient
Symbols and Terminology for Physical and Chemical Quantities
Scientific Abbreviations, Acronyms, and Symbols
Section 19: Covers and Indices
Periodic Table of the Elements
Standard Atomic Weights in Atomic Order Number
Fundamental Physical Constants - Frequently Used Constants
