EVERYTHING OCCUPIES SPACE 



159 



60. Everything Occupies Space. 



We have no doubt that solids and liquids occupy 

 space and we would not try to put one solid in the space 

 which another solid is occupying. Yet we might think 

 that 'a solid could be placed in a liquid without forcing 

 the liquid away, since the liquid does not always show 

 that its surface has risen. Do you remember how the 

 crow obtained his drink of water from the deep dish 

 which had only a little water in it? Putting one kind of 

 material in the place of another is called displacement. 



It is very hard to realize that gases occupy space but 

 they: do, as we shall see in this experiment. 



Experiment 66. Displacement of Water by Solids 

 and Air. 



Apparatus: Two glasses, stone, block of wood, 

 string, funnel, glass tube, rubber tube, large bottle or jar, 

 graduate, rule. 



a. Note the level of the water when one glass is 



about half full of water, and then lower the stone as 

 shown in the illustration. What happens to. the level of 

 the water? Explain. 



