338 Effects of Temperature and Pressure on Thermal Conductivity. 



at a number of temperatures between that of liquid air and the 

 melting point of the substance : Ice, glycerine, aniline, paraffin wax, 

 naphthaline, /3-naphthol, para-nitrophenol, and diphenylamine. 



The results show a marked increase of the conductivities of ice, 

 naphthaline, aniline and nitrophenol, and a slight increase of those of 

 /3-naphthol, and diphenylamine at low temperatures. Glycerine has a 

 maximum conductivity about - 80 C., and paraffin wax shows a 

 tendency to behave in the same way. 



A few values of the conductivities for a portion of the range of 

 temperature are given in the following table: 



The temperatures are given in terms of the hydrogen scale, measured 

 from the absolute zero, the thermal conductivities in c.g.s: units. 



It will be noticed that the thermal conductivities are much greater in 

 the solid than in the liquid state in the case of water and aniline, but 

 almost alike in the case of glycerine. 



