262 



GENERAL SCIENCE 



creases 1 pound per square inch. If an object were 10 feet under 

 water, the pressure on that object per square foot would be 10 times 

 62| pounds (625 pounds per square foot) or 4.34 pounds per square 

 inch, since the increase in pressure is .434 pound per square inch 

 for each foot in depth. 



DENSITIES OF SOME HOUSEHOLD MATERIALS 



* Minimum butter fat content for cream (definition of Bureau of Chemistry), 

 t The density of maple syrup varies from 1.32 with 35 per cent of water to 1.34 with 32 per cent 

 of water. 



This water pressure is so great in the ocean that divers and 

 submarines are unable to go to any great depth. The greatest depth 

 on record to which a diver hafe gone is slightly over 300 feet. (What 

 would be the pressure on a human being 300 feet under water?) 



Some very interesting fish have been found in the ocean at the 

 depth of 3 or 4 miles. Because of the enormous pressure at great 

 depths in the ocean, it was only recently that scientists were con- 

 vinced that life could exist there. 



