HEAT, 



heat is required to make water boil 

 than when it Is at 28 inches. 



Ex. The effect of a reduced pressure 

 in promoting the vaporization of fluids 

 may be illustrated with the aid of an 

 air-pump. A portion of water below 

 the boiling point being put into a small 

 glass jar, and placed under the receiver 

 of an air-pump, on exhausting the re- 

 ceiver ebullition will commence with 

 great violence, and continue until the 

 water is reduced to 70 of Fahrenheit, 



because, by the action of the pump, the 

 pressure of the air is greatly reduced. 

 This experiment proves the utility of the 

 air's pressure; for without it water 

 would be incapable of remaining in the 

 fluid state, and would all assume the 

 state of vapour. 



Dr. Ure has given the following 

 table in his Dictionary of Chemistry, 

 of the boiling points of the most im- 

 portant liquids according to Fahren- 

 heit's scale : 



TABLE of Boiling Points. 



Ether sp. gr. 0.7365 at 48 



Carburet of sulphur 



Alcohol, sp.gr.. . 0.813 



Nitric acid 1 .500 



Water - 



Saturated sol. of Glaub. salt 



Ditto Sugar of lead 



Ditto Sea salt 



Muriate of Lime .. 1 + water 2 



Ditto 35.5 + dilto 64.5 



Ditto 40.5 + ditto 59.5 



G. Lussac. 



Ditto 



Ure 



Dalton 



Muriatic acid .... 



Ditto 



Ditto 



Nitric acid 



Ditto 



Ditto 



Ditto 



Ditto 



Ditto 



Rectified petroleum 

 Oil of turpentine . . 

 Sulph. acid. sp. gr. 



Ditto 



Ditto 



Ditto 



Ditto 



Ditto , 



Ditto 



Ditto 



Ditto 



Ditto 



Ditto 



Ditto 



Ditto 



Ditto 



Ditto 



Ditto 



Ditto 



Ditto 



Phosphorus 



Sulphur 



Linseed oil 



Mercury (Dulong 662 



.094 



.127 



.017 



.45 



.42 



.40 



.35 



.30 



.16 



.30 



.408 



.520 , 



.650 



.670 



.699 



.730 



.780 



.810 



.819 



.827 



.833 



.812 



.841..'. 



.848 



.849... 



1.848 



Biot 



Ditto 



Ditto 



Ure 



Ditto 



Ditto 



Dalton 



Ditto 



Ditto 



Ditto. ... 



Ditto 



Ditto 



Ditto 



Ditto 



Ditto 



Ure 



Ditto 



Dalton . . . 



Ditto 



Ditto 



Ditto 



Ditto 



Ditto 



Ditto 



Ditto 



Ditto 



Ditto 



Ditto 



Ditto 



Ditto.. .. . 

 Ditto.. . . . 



Ditto 



Ditto 



Ditto. . . . 

 Ure . 



The vapours which arise from these inches of mercury, 



liquids, at their boiling points, are ca- arising at inferior 



pable of balancing a pressure of the less elastic power, 

 atmosphere equivalent to that of thirty 



100 

 113 



173.5 



210 



212 



213J 



215| 



224 



230 



235 



240 



232 



222 



222 



240 



248 



247 



242 



236 



220 



306 



316 



240 



260 



290 



350 



360 



374 



391 



435 



473 



487 



501 



515 



545 



575 



590 



605 



620 



600 



554 



570 



640 



656 



but the -vapours 

 temperatures have 



