238 OUTLINES OF NATURAL PHILOSOPHY. 



reckoned from the ordinary boiling point of the li- 

 quid, or that at which it boils when the barometer 

 stands at 30 inches. 



Manchester Memoirs, vol. v. p. 564. MURRAY'S Che- 

 mistry, vol. i. p. 



333. In permanently elastic fluids, the law that 

 connects the temperature and the elasticity, is 

 simpler than in the preceding instances ; for when 

 the temperature increases in arithmetical, the ela- 

 sticity increases in geometrical progression, and 

 the difference between the temperature of freezing 

 and boiling water, increases the elasticity and the 

 bulk of such fluids from 1 to 1.376. 



If, therefore, the elasticity of such a fluid, at the tem- 

 perature of freezing, be called 1 ; if x be any num- 

 ber of degrees above that temperature; and f the 



X 



corresponding elasticity, f= (1.376) 18 ' 

 In logarithms, log/= -|g' x log (1.376). 



If the bulk at the temperature of freezing be = 1, 

 the bulk at the temperature x is also 



X 



= (1.376) iso ' 

 2 If 



