Tables 286, 287. 279 



DIELECTRIC CONSTANTS* 



TABLE 286. — Dielectric Constant (Specific IndnctlTO Oapaolty) Of Gasos. 

 Atmospheric Pressure. 



Wave-lengths of the measuring current greater than loooo cm. 



Gas. 



Temp. 



°C 



Dielectric constant 

 referred to 



Vacuum= i 



Air=i 



Authority. 



Air 



Ammonia 



Carbon bisulphide . . . 



Carbon dioxide .... 

 (< << 



Carbon monoxide .... 



Ethylene 



Hydrochloric acid . . . 

 Hydrogen 



Methane 



Nitrous oxide (N2O) . . 



If « a 



Sulphur dioxide .... 

 i< <i 



Water vapor, 4 atmospheres 



o 

 100 



100 

 o 



c 



o 



o 

 o 



o 

 o 



M5 



1.000590 

 1.000586 



1.007 18 



1.00290 

 1.00239 



1.000946 

 1.000985 



1.000690 

 1.000695 



1.00131 

 1. 00 1 46 



1.00258 



1.000264 

 1 .000264 



1.000944 

 1.000953 



1.00116 

 1 .00099 



1.00993 

 1.00905 



1.00705 



1 .000000 

 1. 000000 



1 .00659 



1. 0023 1 

 1. 00180 



1.000356 

 1.000399 



1. 0001 00 

 1. 000109 



1.00072 

 1.00087 



1.00199 



0.999674 



0.999678 



1.000354 

 1.000367 



1.00057 

 1.00041 



1.00934 

 1.00846 



1,00646 



Boltzmann, 1875. 

 KlemenCiC, 1885. 



Badeker, 1901. 



KlemenCiC. 

 Badeker. 



Boltzmann. 

 KlemenCiC. 



Boltzmann. 

 KlemenCiC. 



Boltzmann. 

 KlemenCiC. 



Badeker. 



Boltzmann. 

 KlemenCiC. 



Boltzmann. 

 KlemenCiC. 



Boltzmann. 

 KlemenCie. 



Badeker. 

 KlemenCiC. 



Badeker. 



TABLE 287.— Variation of the Dielectric Constant with the Temperatnre. 



For variation with the pressure see next table. 



If Z>9 = the dielectric constant at the temperature 6° C, Dt at the tempera- 

 ture t° C, and a and )8 are quantities given in the following table, then 



Dq = Dt\\— a{i— e) + i3(/— 0)2]. 



The temperature coefficients are due to Badeker. 



The dielectric constant of air at atmospheric pressure but with varying tem- 

 perature may also be calculated from the fact that £> — i is approximately pro- 

 portional to the density. 



Smithsonian Tables. 



