MOLECULAR ENERGY 303 



Matter and energy, the two realities of science, are 

 both " granular." 



In this theory we have the modern meeting point 

 of physics, chemistry, and physical chemistry. Origi- 

 nally derived to explain certain difficulties met by 

 older theories in the electromagnetic radiation of light, 

 it has been applied to the quantitative expression of 

 specific heats of solids in an equation involving the 

 physical constants met with in the study of gases. 

 This equation may therefore be applied to the deter- 

 mination of the number of molecules per mole. The 

 method used consists first in determining from the 

 relations expressed in the laws of thermodynamics an 

 expression for the energy of radiation of a " black 

 body" in terms of the total energy of the body. For 

 the total energy the value expressed in terms of elec- 

 tronic oscillators is then substituted. The actual 

 radiation is measured by observing its heating effect. 

 The value of N, thus determined, is quoted as 64X10 22 

 in the table of page 282. 



