The dielectric constant (ε), also known as the relative permittivity, is a measure of a material's ability to store electrical energy in an electric field. It is an important property in many areas of science and engineering, particularly in the study of electromagnetism, materials science, and electrochemistry.
ε is a dimensionless constant that indicates the ease with which a material can be polarized by applying an electric field to an insulating material. The constant is the ratio between the ability of the actual material to carry alternating current and the ability of the vacuum to carry current.
The dielectric constant can be expressed as ε = εs / ε0.
where
ε = dielectric constant
εs = static dielectric constant of the material
ε0 = vacuum dielectric constant
This table lists the dielectric constants of various common fluids in alphabetical order.
All A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
| Liquid | Temperature (℃) | Dielectric Constant (ε) |
| Acetal | 25 | 3.8 |
| Acetaldehyde | 18 | 21.8 |
| Acetamide | 91 | 67.6 |
| Acetic acid | 20 | 6.2 |
| Acetone | 25 | 20.7 |
| Acetonitrile | 20 | 36.6 |
| Acetophenone | 18 | |
| Acetyl bromid | 16.2 | |
| Acetyl chloride | 22 | 15.8 |
| Acetylacetone | 23 | |
| Acetylene | -78 | 2.48 |
| Acetylene dibromide | 7.2 | |
| Acetylene tetrabromide | 5.6 | |
| Acrylonitrile | 20 | 33 |
| Aconite acid ester | 6.3 | |
| Adipic Acid | 1.8 | |
| Aerosile | 1 | |
| Alcohol, allyl | 20 | 19.7 |
| Alcohol, benzyl | 30 | 11.9 |
| Alcohol, cetyl | 60 | 3.6 |
| Alcohol, diacetone | 18.2 | |
| Alcohol, ethyl (ethanol) | 20 | 25.3 |
| Alcohol, methyl (methanol) | 20 | 33 |
| Alcohol, propyl | 20 | 21.8 |
| Allene | -4 | 2.03 |
| Allylbenzene | 20 | 2.63 |
| Allyl chloride | 8.2 | |
| Allyl iodide | 6.1 | |
| Allyll isocyanate | 15 | 15.2 |
| Aluminum bromide | 100 | 3.38 |
| Ammonia | 20 | 16.61 |
| Ammonia solution 25% | 31.6 | |
| Amyl amine | 4.5 | |
| Aniline | 20 | 7.06 |
| Anisole | 21 | 4.3 |
| Antimony hydride | 1.8 | |
| Anthracene | 229 | 2.65 |
| Argon | -133 | 1.32 |
| Arsine | 2.1 | |
| Arsole | 2.3 | |
| Azoxybenzene | 36 | 5.2 |
| Benzaldehyde | 20 | 17.9 |
| Benzene | 20 | 2.28 |
| Benzil | 95 | 13.04 |
| Benzonitrile | 20 | 25.9 |
| Benzyl acetate | 30 | 5.34 |
| Benzyl formate | 30 | 6.34 |
| Benylamine | 20 | 5.18 |
| Biphenyl | 75 | 2.35 |
| Bromine | 25 | 3.15 |
| Bromine trifluoride | 25 | 107 |
| Bromoethane | 25 | 9.01 |
| Butane | 22 | 1.77 |
| Butanoic acid | 3 | |
| 1-Butanol | 20 | 17.8 |
| Butyl acetate | 20 | 5.07 |
| Butyl acrylate | 28 | 5.25 |
| Butylamine | 20 | 4.71 |
| Butylbenzene | 20 | 2.36 |
| Butyl nitrate | 20 | 13.1 |
| Caproic acid | 71 | 2.6 |
| Caprylic acid | 2.5 | |
| Carbon dioxide | 22 | 1.45 |
| Carbon disulfide | 20 | 2.63 |
| Carbon tetrachloride | 20 | 2.23 |
| Castor Oil | 15 | 4.7 |
| Chlorine, chlor fluid | -65 | 2.15 |
| Chlorine pentafluoride | -80 | 4.28 |
| Chlorine trifluoride | 20 | 4.39 |
| Chlor benzene | 5.7 | |
| Chloroacetic acid | 65 | 12.4 |
| Chlorocyclohexane | 30 | 7.95 |
| Chloroethane | 20 | 9.45 |
| Chloroform | 20 | 4.8 |
| Chlorodifluoromethane refrigerant R-22 | 25 | 2 |
| Coconut oil, refined | 2.9 | |
| Cotton seed oil | 3.1 | |
| Cresol | 17 | 10.6 |
| Cumene | 20 | 2.4 |
| Cyanoacetic acid | 4 | 33.4 |
| Cyanoacetylene | 19 | 72.3 |
| Cycloheptane | 20 | 2.08 |
| Cycloheptene | 22 | 2.27 |
| Cyclohexane | 20 | 2.02 |
| Cyclohexene | 20 | 2.22 |
| Decane | 20 | 2 |
| Diacetone alcohol | 25 | 18.2 |
| Dichlorodifluoromethane refrigerant R-12 | 25 | 2 |
| Diesel oil, fuel | 2.1 | |
| Diethyl ether | 20 | 4.27 |
| Diethyl sulfide | 25 | 5.7 |
| Difluoromethane | -121 | 53.7 |
| Dimethyl ether | -15 | 6.18 |
| Docosane | 20 | 2.08 |
| Dodecane | 20 | 2.01 |
| Ethane | -178 | 1.94 |
| Ether | 20 | 4.3 |
| Ethylamine | 21 | 6.3 |
| Ethylene glycol | 20 | 37 |
| Ethoxybenzene | 20 | 4.22 |
| Ethylamine | 0 | 8.7 |
| Ethyl acrylate | 30 | 6.05 |
| Ethylbenzene | 20 | 2.44 |
| Ethylene | -3 | 1.48 |
| Ethyl isocyanate | 20 | 19.7 |
| Ethyl lactate | 30 | 15.4 |
| Ethyl salicylate | 35 | 8.48 |
| Ethyl silicate | 20 | 2.5 |
| Eucalyptol | 25 | 4.57 |
| Fish oil | 2.6 | |
| Fluorbenzene | 20 | 6.4 |
| Fluorine | -220 | 1.49 |
| Fluoromethane | -142 | 51 |
| Formamide | 20 | 111 |
| Formic acid | 25 | 51.1 |
| Furan | 25 | 2.94 |
| Furfural | 20 | 42.1 |
| Furfuryl alcohol | 25 | 16.9 |
| Gasoline, gas | 21 | 2 |
| Glycerine | 47-68 | |
| Glycerol | 20 | 46.5 |
| Glycerol water | 37 | |
| Glycol | 37 | |
| Helium | -271 | 1.056 |
| Heptadecane | 20 | 2.06 |
| Heptanal | 22 | 9.07 |
| Heptane | 20 | 1.92 |
| Heptanoic acid | 15 | 3.04 |
| 1-Heptanol | 20 | 11.75 |
| Heptyl acetate | 20 | 4.2 |
| Heptylamine | 20 | 3.81 |
| Heptylbenzene | 20 | 2.26 |
| Hexadecane | 20 | 2.05 |
| Hexane | 20 | 1.89 |
| Hexanoic acid | 25 | 2.6 |
| 1-Hexanol | 20 | 13.03 |
| 1-Hexene | 21 | 2.1 |
| Hexyl acetate | 20 | 4.42 |
| Hexylamine | 20 | 4.1 |
| Hexylbenzene | 20 | 2.3 |
| Hydrazine | 25 | 51.7 |
| Hydrogen | -260 | 1.279 |
| Hydrogen bromide | -86 | 8.23 |
| Hydrogen chloride | -114 | 14.3 |
| Hydrogen cyanide | 20 | 114.9 |
| Hydrogen fluoride | 0 | 83.6 |
| Hydrogen peroxide | 17 | 74.6 |
| Hydrogen sulfide | 10 | 5.93 |
| Iodine | 118 | 11.08 |
| Iodine heptafluoride | 25 | 1.75 |
| Isobutane | 22 | 1.75 |
| Isobutyl acetate | 20 | 5.1 |
| Isobutylbenzene | 20 | 2.3 |
| Isopentane | 20 | 1.85 |
| Isopentyl acetate | 20 | 4.72 |
| Isopentyl lactate | 0 | 11.2 |
| Isopentyl salicylate | 20 | 7.26 |
| Isopropanol (2-Propanol, Isopropyl alcohol, propan-2-ol, (CH3)2CHOH) | 18.2 | |
| Isopropylamine | 20 | 5.6 |
| Isopropylbenzene | 20 | 2.38 |
| Jet fuel | 21 | 1.7 |
| Kerosene | 21 | 1.8 |
| Krypton | -153 | 1.66 |
| Lead chloride | 20 | 2.78 |
| Linoleic Acid | 0 | 2.6-2.9 |
| Linseed Oil | 3.2-3.5 | |
| Menthol | 36 | 3.9 |
| Mercury (vapor) | 148 | 1.00074 |
| Methane | -182 | 1.68 |
| Methyl acetate | 15 | 7.07 |
| Methyl acrylate | 30 | 7.03 |
| Methylamine | -58 | 16.7 |
| Methyl benzoate | 30 | 6.64 |
| Methylcyclohexane | 20 | 2.02 |
| Methyl nitrate | 20 | 23.9 |
| Methyl nitrite | 27 | 27.8 |
| Napthalene | 20 | 2.5 |
| Neon | -247 | 1.19 |
| Neopentane | 23 | 1.77 |
| L-Nicotine | 20 | 8.9 |
| Nitric oxide | -149 | 2 |
| Nitrobenzene | 20 | 35.6 |
| Nitroethane | 15 | 29.1 |
| Nitrogen | -210 | 1.47 |
| Nitrogen tetroxide | 20 | 2.44 |
| Nitromethane | 20 | 37.3 |
| Nonane | 20 | 1.97 |
| Nonanoic acid | 22 | 2.48 |
| 1-Nonanol | 20 | 8.83 |
| Nonyl acetate | 20 | 3.87 |
| Octane | 20 | 1.95 |
| Octanoic acid | 15 | 2.85 |
| Octyl acetate | 15 | 4.18 |
| Oil | 2 | |
| Olive Oil | 20 | 3.1 |
| Oxygen | -219 | 1.57 |
| Ozone | -183 | 4.75 |
| Palmitic Acid | 71 | 2.3 |
| Palm seed oil | 1.8 | |
| Paraffin | 1.6 | |
| Pentaborane | 25 | 21.1 |
| Pentadecane | 20 | 2.04 |
| Pentanal | 20 | 10 |
| Pentane | 20 | 1.84 |
| Pentanoic acid | 21 | 2.66 |
| Pentamethylbenzene | 61 | 2.36 |
| 1-Pentanol | 25 | 15.3 |
| Pentyl acetate | 20 | 4.79 |
| Pentylamine | 20 | 4.27 |
| Pentyl nitrite | 25 | 7.21 |
| Pentyl salicylate | 28 | 6.25 |
| Phenol | 30 | 12.4 |
| Phenyl acetate | 25 | 5.4 |
| Phenylacetylene | 25 | 2.98 |
| Phosgene | 0 | 4.7 |
| Phosphorus liquid | 3.9 | |
| Pinane | 25 | 2.15 |
| Pinene | 20 | 2.7 |
| Propane | 20 | 1.67 |
| Propanenitrile | 20 | 29.7 |
| Propanol (propyl alcohol, 1-Propanol, n-propanol, or propan-1-ol, CH3CH2CH2OH) | 20.1 | |
| Propene | -53 | 2.14 |
| Propyl acetate | 20 | 5.62 |
| Propylamine | 23 | 5.08 |
| Propylbenzene | 20 | 2.37 |
| Propylene | 11.9 | |
| Propylether | 3.3 | |
| Pyrazine | 50 | 2.8 |
| Pyridine | 20 | 1.12 |
| Resorcinol | 3.2 | |
| Stearic Acid | 71 | 2.3 |
| Styrene | 20 | 2.47 |
| Sulfur | 134 | 3.5 |
| Sulfur dioxide | 20 | 14.3 |
| Terpinene | 17 | 2.7 |
| Thymol | 60 | 4.3 |
| Toluene | 23 | 2.38 |
| Transformer oil | 2.1 | |
| Trichlorofluoromethane refrigerant R-11 | 20 | 2 |
| Turpentine (wood), white spirit | 20 | 2.2 |
| Vacuum (by definition) | 1 | |
| Vinegar | 24 | |
| Water | 20 | 80.1 |
| Water | 360 | 10 |
| Water, demineralised | 29.3 | |
| Water, heavy | 78.3 | |
| Water - oil emulsion | 24 | |
| Wine | 25 | |
| Xenon | -112 | 1.88 |
| o-Xylene | 20 | 2.56 |
| m-Xylene | 20 | 2.36 |
| p-Xylene | 20 | 2.27 |
| Xylitol | 20 | 40 |
