DENSITY AND SPECIFIC GRAVITY 45 



18. In which would a boat sink deeper, a river or the ocean? 



19. If the ice man leaves a piece of ice 50 by 40 by 10 cm. in size has 

 he left 50 pounds or not? (Ice has a specific gravity of .9.) 



20. A liter of hydrogen weighs about .09 gram. How much heavier 

 is water than hydrogen? 



21. If a body sinks half of its volume in water, what is its specific 

 gravity? 



22. What is its specific gravity if it sinks half its volume in mercury? 



23. In which should it be easier to swim, salt or fresh water? Why? 



24. With what force does gravity attract a kilogram weight? 



