Energy 13 



that "heat may be measured in units of 

 energy." 



The second fundamental fact or principle 

 is that energy equalizes itself by radiation 

 from centers of high potential, and can be 

 concentrated or stored only by the expendi- 

 ture of other energy. This is analogous to the 

 statement that water seeks a level and can be 

 raised to a higher level only by the perform- 

 ance of work. This is known as the Dissipa- 

 tion of Energy. A special statement of this 

 principle is known as the "second law" of 

 thermodynamics, and is to the effect that 

 "heat cannot pass of itself from a colder to a 

 hotter body." 



These principles have been recognized by 

 science for such a length of time that it is no 

 longer necessary to mention them except for 

 the purpose of pointing out some fundamen- 

 tal error, or for the purpose of laying the 

 foundation for a new argument. Both of 

 these reasons for calling attention to these 

 two fundamental principles exist in this case. 



Both matter and energy take on many 



