133 



WELLS'S NATURAL PHILOSOPHY. 

 Fig. 125. 



With what 

 force is a iloat- 

 iiigbody iireBs- 

 cd upward ? 



How mnch 

 water will a 

 Bolid immersed 

 ia it displace ? 



"What is Buoy, 

 ancy ? 



310. When a solid is immersed in a liquid 

 it will be pressed upward with a force equal 

 to the weight of the liquid it displaces. 



311. A solid immersed in water will displace 

 as much of the liquid as is equal in volume to 

 the part immersed. 



312. Buoyancy is the name applied to the 

 force by which a solid immersed in a liquid is 



heaved, or pressed upward. 



The resistance offered when we attempt to sink a body hghter than water 

 in that Hquid, proves that the water presses with a force upward as well aa 

 downward. Upon this fact the laws of floating bodies depend ; and for this 

 reason the bottoms of large ships are constructed with a great degree of 

 Btrength. 



313. A body floating upon a liquid is main- 

 tained in EQUiLiBRio by the operation of grav- 

 ity drawing the mass downward, and by the 

 pressure of the particles of the liquid upon 



which it rests, pressing it upward. 



whatisessen- ^14. lu ordcr that a body may float with sta- 

 buitj^ofaflolt ^ility, it is necessary that its center of gravity 

 ingbodyf should bc sltuatcd as low as possible. 



How is a body 

 floating upon a 

 liquid main- 

 tained in equi- 

 librio ? 



