- Acentric Factor - Calculated value using the accepted critical temperature, critical pressure, and vapor pressure correlation.
- Autoignition Temperature - The minimum temperature for a substance to initiate self-combustion in air leading to thermal runaway and a visible flame in the absence of an ignition source such as a spark or piloting flame, per some set of conditions.
- Critical Compressibility Factor - The value of the compressibility factor at the critical temperature.
- Critical Pressure - The minimum pressure required for liquefaction of a gas at the critical temperature.
- Critical Temperature - The temperature above which a gas cannot be liquefied.
- Critical Volume - Molar volume of the substance at its critical point.
- Dielectric Constant - Ratio of the electric field strength in vacuum to that in the material for the same charge distribution. Equivalently, it is the ratio of the capacitance between two parallel charged plates when filled with the material to that of a vacuum with identical charges on the plates. The value is reported at the reference temperature and pressure.
- Dipole Moment - The first moment of the electric charge density expansion of a molecule.
- Density, Liquid - Number of moles of a substance per unit volume in the liquid state.
- Density, Solid - Number of moles of substance per unit volume in the solid state.
- Flammability Limits - The minimum/maximum concentration in air that will support flame propagation at the reference temperature.
- Flammability Temperature Limits - The lowest and highest temperatures, corrected to 101.3 kPa, at which the vapor/air mixture will support flame propagation.
- Flash Point - Lowest temperature, corrected to a pressure of 101325 Pa, at which application of an ignition source causes the vapors of a specimen in air to ignite under specified conditions of test.
- Heat Capacity, Ideal Gas - The amount of energy required to change the temperature of a unit mole of vapor one degree when the vapor is ideal; i.e., there are no intermolecular interactions.
- Heat Capacity, Liquid - The amount of energy required to change the temperature of a unit mole of liquid one degree at constant pressure.
- Heat Capacity, Solid - The amount of energy required to change the temperature of a unit mole of solid one degree.
- Heat of Fusion - The molar change in enthalpy when the solid is isothermally converted into a liquid at its melting point.
- Heat of Sublimation - The molar change in enthalpy when the solid is isothermally converted into a gas at its triple point temperature.
- Heat of Vaporization - Difference between the enthalpies of a unit mole of a saturated vapor and saturated liquid of a pure component at any temperature and corresponding vapor pressure.
- Henry’s Law Constant of the Chemical in Water - Property calculated from the partial fugacity and the mole fraction in the liquid phase of a chemical in solution in which the solvent is water.
- Ideal Gas Absolute Entropy - Absolute entropy of the ideal gas at 298.15 K and 1 bar.
- Ideal Gas Gibbs Energy of Formation - The change in Gibbs energy associated with the reaction of forming the given chemical in the ideal gas state at 298.15 K and 1 bar from the elements in their standard states. The standard state for the elements is the stable phase at 298.15 K and 1 bar.
- Ideal Gas Heat of Formation - The enthalpy change associated with the formation reaction of the given chemical in the ideal gas state at 298.15 K from the elements in their standard states. The standard state for the elements is the stable phase at 298.15 K and 1 bar.
- Infinite Dilution Activity Coefficient of the Chemical in Water - Property calcualted from the infinite dilution activity coefficient, the partial fugacity, the pure liquid fugacity and the mole fraction in the liquid phase of a chemical in solution in which the solvent is water.
- Liquid Molar Volume - Molar volume of the liquid at a reference temperature and pressure.
- Melting Point Temperature - Temperature at which melting occurs at atmospheric pressure.
- Molecular Weight - Molecular weight of the chemical as determined from the sum of the IUPAC atomic weights.
- Normal Boiling Point - Temperature at which the liquid vapor pressure equals 101325 Pa.
- Parachor - Property calculated from the surface tension.
- Radius of Gyration - Defined in terms of the principal moments of inertia for a molecule.
- Refractive Index - Ratio of the speed of light in a vacuum to the speed of light in the substance. The incident light is the sodium D line (0.5896 microns). The value is reported at the reference temperature and pressure.
- Second Virial Coefficient - The first correction factor from ideal gas in the virial expansion of the compressibility factor.
- Solubility of the Chemical in Water - The maximum amount, in mole fraction, of a substance (gas, liquid, or solid) that will dissolve in water at the defined temperature and pressure.
- Solubility Parameter - Calculated value of the energy required to isothermally vaporize the liquid to the ideal gas state at a reference temperature and pressure.
- Standard State Absolute Entropy - Absolute entropy of the given chemical in the standard state. The standard state is defined as 298.15 K, 1 bar, and the stable phase at these conditions.
- Standard Net Heat of Combustion - The increase in enthalpy when a substance in its standard state at 298.15 K and 1 bar undergoes oxidation to defined combustion products. These combustion products are CO2 (g), H2O (g), F2 (g), Cl2 (g), Br2 (g), I2 (g), SO2 (g), N2 (g), P4O10 (cr), SiO2 (cristobalite), and Al2O3 (crystal, alpha).
- Standard State Gibbs Energy of Formation - The change in Gibbs energy associated with the reaction of forming the given chemical in its standard state from the elements in their standard states. The standard state in both cases is the stable phase at 298.15 K and 1 bar.
- Standard State Heat of Formation - The change in enthalpy associated with the reaction forming the given chemical in its standard state from the elements in their standard states. The standard state in both cases is the stable phase at 298.15 K and 1 bar.
- Surface Tension - The inherent force in the plane of the surface of a gas-liquid interface per unit length of surface which tends to minimize the surface area.
- Thermal Conductivity, Liquid - The proportionality constant in Fourier’s law of heat conduction which describes the rate at which heat flows through a liquid.
- Thermal Conductivity, Solid - The proportionality constant in Fourier’s law of heat conduction which describes the rate at which heat flows through a solid.
- Thermal Conductivity, Vapor - The proportionality constant in Fourier’s law of heat conduction which describes the rate at which heat flows through a vapor. The value is the ratio of energy flux per unit time divided by the temperature change per unit distance in the substance.
- Triple Point Pressure - Pressure at which equilibrium exists between solid, liquid, and vapor.
- Triple Point Temperature - Temperature at which solid, liquid, and vapor of the substance are all in equilibrium.
- Van der Waals Volume and Van del Waals Area - The excluded volume and surface area of model molecules treated as hard-sphere beads separated by rigid bonds.
- Vapor Pressure, Liquid - Vaporization pressure for liquid-vapor equilibrium.
- Vapor Pressure, Solid - Sublimation pressure for solid-vapor equilibrium.
- Viscosity (absolute), Liquid - The shear stress per unit area at any point in a confined Newtonian liquid fluid divided by the velocity gradient in the direction perpendicular to the direction of flow.
- Viscosity, Vapor - The shear stress per unit area at any point in a confined Newtonian vapor divided by the velocity gradient in the direction perpendicular to the direction of flow.
