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Dielectric Constant or relative permittivity of Gases


Table below gives the relative permittivity ε or the dielectric constant of some common gases at a temperature of 68°F (or 20 °C) and pressure of one atmosphere. Values of the permanent dipole moment μ in Debye Units (1 D = 3.33564 × 10–30 C m) are also included.

The density dependence of the permittivity is given by the equation:


Molecular formula Name ε
μ/D
Air (dry,CO2 free)1.0005364
ArArgon1.00051720
BF3Boron trifluoride 1.00110
BrHHydrogen bromide 1.002790.827
ClHHydrogen chloride 1.00391.109
F3NNitrogen trifluoride 1.00130.235
F6SSulfur hexafluoride 1.0020
HIHydrogen iodide 1.002140.448
H2Hydrogen 1.00025380
H2SHydrogen sulfide1.003440.97
H3NAmmonia1.006221.471
HeHelium1.0000650
KrKrypton1.000780
NONitric oxide 1.00060.159
N2Nitrogen 1.0005480
N2ONitrous oxide1.001040.161
NeNeon1.000130
O2Oxygen1.00049470
SO2Sulfur dioxide 1.008251.633
O3Ozone1.00170.534
XeXenon1.001260



Table below gives the relative permittivity ε or the dielectric constant of gases containing carbon at a temperature of 68°F (or 20 °C) and pressure of one atmosphere. 


Molecular formula Name ε μ/D
CF4Tetrafluoromethane1.001210
COCarbon monoxide1.000650.11
CO2Carbon dioxide1.0009220
CH3BrBromomethane1.010281.822
CH3ClChloromethane1.01081.892
CH3FFluoromethane1.009731.858
CH3IIodomethane1.009141.62
CH4Methane1.000810
C2H2 Acetylene1.001240
C2H3ClChloroethylene1.00751.45
C2H4Ethylene1.001340
C2H5ClChloroethane1.013252.05
C2H6Ethane1.00140
C2H6ODimethyl ether1.00621.3
C3H6 Propene1.002280.366
C3H6 Cyclopropane1.001780
C3H8 Propane1.0020.084
C4H10Butane1.002580
C4H10Isobutane1.00260.132



Tags: relative-permittivity dielectric-constant