RICHARDS. — NOMENCLATURE OF HEAT CAPACITY. 329 



perature, according to the well-known equation (7y, — C.j. = rp, _ rp ' 



where capacities are represented by C, heats of reaction by U, aud 

 temperatures by T. 



Since entropy has the dimensions of heat capacity, it too may be 

 measured in mayers. This application of the new name may lend 

 concreteness to an idea which has been to some a stumbling-block. 



The greatest gain to be derived from the consistent use of the " abso- 

 lute " unit of heat capacity is to be found in the field of electrochemistry. 

 Here even teclmical men have used for several years the admirable 

 system of units resting upon the centimeter-gram-second basis. The 

 increasing use of both the thermodynamic and osmotic equations of 

 electrochemistry will make the ready application of these units to heat 

 and gas energy almost a necessity. 



Cambridge, Mass., October 31, 1900. 



