AND Till: RELATION OF SPECIFIC HEAT TO ATOMIC WEIGHT. 



These values are given for cobalt and nickel in a table below. 



Our ignorance of the molecular state of a solid is so great that we cannot even 

 speculate on how it is that when 1 gramme of cobalt at 50 C. rises in temperature 

 to 51 C., whether it is allowed to expand freely or is subjected to great hydrostatic 

 pressure which prevents expansion, the energy '041 enters it as what may be called 

 the real sensible heat, and the energy '062 (or one and a half times as much) enters 

 .it as some kind of energy of disgregation necessary l)ecause of change of temperature 

 and having nothing to do with change of volume or pressure. The facts are not 

 explainable by assuming that the atomic weights are wrong, because as we see from 

 cobalt and nickel, K approaches the value k Q at low temperatures. 



A table of temperatures may l)e made out at which for all metals the product of 

 atomic weight and specific heat has any constant value. Thus we take it that at 

 273 C. this product is the same as it is for hydrogen or any elementary gas. At 

 the following temperatures the product is 2 '6 times what it is for hydrogen, and the 

 product of K and atomic weight is in every case 6 '28. 



We have no doubt if we had information to prepare exact tables of this kind 

 (dealing with k/k rather than K/ ) we should find these temperatures related to 

 other physical properties. 



Dr. TILDEN'S measurements of the mean specific heat of cobalt and nickel in the 

 following ranges of temperature are : 



