Section: 6 | Permittivity (Dielectric Constant) of Liquids |
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John R. Rumble, ed., CRC Handbook of Chemistry and Physics, 102nd Edition (Internet Version 2021), CRC Press/Taylor & Francis, Boca Raton, FL.
If a specific table is cited, use the format: "Physical Constants of Organic Compounds," in CRC Handbook of Chemistry and Physics, 102nd Edition (Internet Version 2021), John R. Rumble, ed., CRC Press/Taylor & Francis, Boca Raton, FL.


Christian Wohlfarth

The permittivity of a substance (often called the dielectric constant) is the ratio of the electric displacement D to the electric field strength E when an external field is applied to the substance. The quantity tabulated here is the relative permittivity, which is the ratio of the actual permittivity to the permittivity of a vacuum; it is a dimensionless number.

The table gives the static relative permittivity ε, i.e., the relative permittivity measured in static fields or at low frequencies where no relaxation effects occur. When available, a temperature close to 20 °C was chosen, or (as it is the case for many of the substances included here) ε is given at the only temperature for which data are available. The static permittivity refers to nominal atmospheric pressure as long as the corresponding temperature is below the normal boiling point. Otherwise, at temperatures above the normal boiling point, the pressure is understood to be the saturated vapor pressure of the substance.

For substances where information on the temperature dependence of the permittivity is available, the table gives the coefficients of a simple polynomial fitting of permittivity to temperature with an equation of the form

ε(T) = a + bT + cT2 + dT3

where T is the absolute temperature in K. 

The coefficients of the fitting equation can be used to calculate dielectric constants within the fitted temperature range but should not be used for extrapolation outside the stated temperature range. The user who needs dielectric constant data with more accuracy than can be provided by this equation is referred to Ref. 1, which gives the original data together with their literature source. Column definitions for the table are as follows.

 The notation E-xy means 10-xy.

Column heading Definition
Name Name of liquid; substances are listed alphabetically by systematic name
Mol. form. Molecular formula of liquid
ε Static relative permittivity (dielectric constant); the value is at the temperature in °C specified by the superscript
a Constant in temperature fitting equation
b Coefficient of T in the temperature fitting equation
c Coefficient of T2 in the temperature fitting equation
d Coefficient of T3 in the temperature fitting equation
Temp. range Temperature range for which the fitting equation is valid, in K


  1. Wohlfarth, Ch., Static Dielectric Constants of Pure Liquids and Binary Liquid Mixtures, Landolt-Börnstein, Numerical Data and Functional Relationships in Science and Technology, New Series, Editor in Chief, O. Madelung, Group IV, Macroscopic and Technical Properties of Matter, Volume 6, Springer-Verlag, Berlin, 1991.
  2. Marsh, K. N., Ed., Recommended Reference Materials for the Realization of Physicochemical Properties, Blackwell Scientific Publications, Oxford, 1987.

Permittivity (Dielectric Constants) of Liquids

NameSynonymMol. form.CAS Reg. No.FormulaεabcdTemp. range/K
Continued on next page...
AcetaldoximeAcetaldehyde oximeC2H5NO107-29-9C2H5NO4.7025
AcetamideEthanamideC2H5NO60-35-5CH3CONH267.691-0.20055E+03 0.15515E+01-0.22392E-02364 - 448
Acetic acidEthanoic acidC2H4O264-19-7CH3COOH6.2020-0.15731E+02 0.12662E+00-0.17738E-03293 - 363
Acetic anhydrideAcetyl acetateC4H6O3108-24-7C4H6O322.4520
2-AcetonaphthoneC12H10O93-08-313.0360 0.14538E+03-0.73040E+00 0.10000E-02333 - 363
Acetone2-PropanoneC3H6O67-64-1(CH3)2CO21.0120 0.88157E+02-0.34300E+00 0.38925E-03273 - 323
AcetonitrileMethyl cyanideC2H3N75-05-8CH3CN36.6420 0.29724E+03-0.15508E+01 0.22591E-02288 - 333
AcetophenoneMethyl phenyl ketoneC8H8O98-86-2C6H5C=OCH317.4425 0.26099E+02 0.64048E-02-0.11905E-03298 - 333
Acetyl chlorideEthanoyl chlorideC2H3ClO75-36-5CH3COCl15.822
N-AcetylethanolamineC4H9NO2142-26-796.625 0.37016E+03-0.13113E+01 0.13214E-02298 - 348
2-(Acetyloxy)benzoic acidAcetylsalicylic acidC9H8O450-78-2C9H8O46.5560 0.69994E+01-0.14553E-02333 - 416
AcrylonitrilePropenenitrileC3H3N107-13-1CH2=CHCN33.020 0.11109E+03-0.36806E+00 0.34879E-03233 - 413
AlleneC3H4463-49-0CH2=C=CH22.025-4 0.26049E+01-0.44147E-03-0.63420E-05156 - 269
Allyl alcohol2-Propen-1-olC3H6O107-18-6C3H6O19.720 0.62714E+02-0.14771E+00 0.37879E-05213 - 303

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