OUTLINES OF NATURAL PHILOSOPHY. 



The correction of the mercurial thermometer, arising 

 from the law of expansion, has not yet been intro- 

 duced ; but the reality of the law itself seems suffi- 

 ciently established. 



324. When fluids of different kinds, and of dif- 

 ferent temperatures, are mixed, as above, the tem- 

 perature of the mixture is very far from corre- 

 sponding with the theorem in article 322, in 

 so much as to make it certain, that equal bodies, 

 for equal differences of temperature, do not con- 

 tain equal quantities of heat. Beside the masses 

 M and M', therefore, we must introduce two in- 

 determinate co-efficients c and c', before the for- 

 mula can be applied ; we have then 



c" (M + M') 

 for the temperature of the mixture, 



In this formula, c and c are the numbers that denote 

 the differences of heat contained in two equal por- 

 tions of these fluids, for equal differences of tempe- 

 rature. They may be said to denote the capacities 

 of the bodies for heat ; and their values must be 

 determined by experiment. 



When equal weights of water and ice are 

 put into the same vessel, the water being -at the 

 temperature 176, and the ice at 32, the ice is in- 



stantly 



