"SUCTION" 115 



made to boil at any temperature between 100 C. and C. 

 Ice may be formed while the boiling continues. See Section 

 24, Evaporation Requires Heat. 

 References : 



1. 1803 : 204-206. Boiling Point Defined. 



a. 1309 : 204. Boiling at High Altitudes. 



6. 1801 : 280-281. Effect of Pressure on Boiling Point. 



c. 1802 : 308. Ebullition. 



d. 1804 : 281-283. Boiling Point. 



e. 1805 : 338-339. Pressure and the Boiling Point. 

 /. 1807 : 200-202. Boiling and Pressure. 



g. 1808 : 232-233. Boiling and Pressure. 



h. 1809:189-191. Boiling and Pressure. 



i. 1810 : 156-159. Boiling Points. 



j. 1811 : 111-112. Effect of Pressure on Boiling Point. 



Experiment 43. Boiling at Reduced Pressure. 



Apparatus: Glass flask 250 c.c., rubber stopper to fit, ring 

 stand, asbestos mat, burner, beaker 100 c.c., battery jar 6" 

 by 8". 



a. Put about 75 c.c. of water into the flask, and let it boil 

 vigorously. While boiling insert the stopper and invert the 

 flask in a ring of the ring stand. Place the battery jar under- 

 neath and pour a few drops of water on the inverted flask. 

 What happens ? Continue to pour water on the flask until 

 all action ceases. The temperature of the inclosed water will 

 be about 15 C. 



b. Why was water boiled vigorously ? Why should only 

 a little cold water be poured on at first ? Why was it difficult 

 to remove the stopper at the end of the experiment ? 



84. "SUCTION" 



The quotation marks indicate a misnomer. Suction really 

 is only half of the process. The other half is atmospheric 



