STEAM. 119 



Q. Why would the INNER vessel boil, if the 

 OUTER vessel contained strong BRINE ? 



A. Though water boils at 212 deg s - 

 of heat, yet brine will not boil till raised 

 to 218 or 220 deg*- Therefore, 212 

 deg*. of heat may easily pass through 

 brine to raise the vessel immersed in it to 

 boiling heat, before any of it is carried off 

 by steam. 



Q. Why will brine impart to another vessel 

 MORE than 212, and water NOT so MUCH? 



A. Because both liquids will impart 

 heat till they boil, and then they can 

 impart heat no longer. 



Q. Why can they impart no extra heat after 

 they boil ? 



A. Because all extra heat is spent in 

 making steam. Hence water will not boil 

 a vessel of water immersed in it, because 

 it cannot impart to it 212 deg s - of heat: 

 but brine will, because it can impart more 

 than 212 deg s - of heat, without being 

 converted itself into steam. 



Ether boils at 104 degs- 

 Alcohol - - 173 

 Water - - 212 

 Water with one- 

 fifth salt - 210 



Syrup boils at 221 degs> 

 Oil of turpentine, 304 

 Sulphuric acid 472 

 Linseed oil - 640 

 &c. &c. 



Any liquid which boils at a lower degree can be made to 



