EXERCISE 23 



DOES A LIQUID FILL ALL THE SPACE WHICH IT APPEAES TO FILL? 



Materials. A glass tube 18 inches long and about | inch in diameter; two cork stoppers to 

 fit the tube ; alcohol. 



Directions. Into the tube, which is stoppered at one end, pour water until it is half full. Inclin- 

 ing the tube, carefully and slowly add enough alcohol to completely fill the tube. Stopper the open 

 end of the tube and invert it several times, until the liquids are completely mixed. Now bring to 

 original upright position. Is the tube now completely filled with the liquids ? How can you account 

 for the decrease in volume of the liquids ? 



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