16 FIRST YEAR COURSE IN GENERAL SCIENCE 



EXERCISE IX (Textbook 68) 



TO FIND THE SPECIFIC GRAVITY OF A SOLID 

 WHICH IS INSOLUBLE IN WATER 



APPARATUS: Balance, sink or jar containing water, 

 thread, solids (such as pieces of stone or coal), glass stopper, 

 cake of wax. 



DIRECTIONS FOR WORK: 



(1) Weigh the solid in air. 



(2) Weigh the solid in water. To do this, tie a thread 

 around the object and suspend it from the balance in a jar 

 of water. Do not allow the object to touch the side or 

 bottom of the jar nor to come to the surface of the water. 



Name of Solid Wt. in Air Wt. in Water 



g- g- 



RESULTS 



1. Do the solids weigh more in air or in water? 



2. How much was the difference in weight, in the case 

 of the first body weighed? 



3. What change occurred in the level of the water when 

 the solid was immersed? Why? 



4. If the volume of a solid used was 50 cu. cm., how many 

 cu. cm. of water did it displace when it was immersed in 

 water? 



5. What is the weight, in grams, of the water displaced? 

 Why? 



6. What is the relation between the weight of the solid in 

 air and the loss of weight in water? Express as a fraction. 



7. Compute to two decimal places these ratios and thus get 

 the specific gravity of each solid. 



Name of Solid Ratio between Weight Specific Gravity 

 and Loss in Water 



