356 TABLES 432, 433. 



DIELECTRIC CONSTANTS. 



TABLE 432. - Dielectric Constant (Specific Inductive Capacity) of Gases. 

 Atmospheric Pressure. 



Wave-lengths of the measuring current greater than 10000 cm. 



TABLE 433, Variation of the Dielectric Constant with the Temperature. 



For variation with the pressure see next table. 



If Z>0 = the dielectric constant at the temperature 6 C., Dt at the tempera- 

 ture / C., and a and are quantities given in the following table, then 



D 9 = Dt [i a(/ 0) + 0(/ 

 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 D i is approximately pro- 

 portional to the density. 

 SMITHSONIAN TABLES. 



