SPECIFIC GRAVITY. 143 



30. A body weighing 1536 g. weighs in water 1283 g.; what is its 

 specific gravity ? 



21. Calculate the specific gravity of sea water from the following 



data 



Weight of bottle empty 3.5305 g. 



" filled with distilled water.... 7.6722 g. 



sea " ... 7.7849 g. 



22. Determine the specific gravity of a piece of wood from the 

 following data : Weight of wood in air, 4 g. ; weight of sinker, 

 10 g.; weight of wood and sinker under water 8.5 g.; specific 

 gravity of sinker, 10.5. 



23. A piece of a certain metal weighs 3.7395 g. in air ; 1.5780 g. 

 in water ; 2.2896 g. in another liquid. Calculate the specific grav- 

 ities of the metal and of the unknown liquid. 



24. Find the specific gravity of a piece of glass if a fragment of 

 it weigh 2160 grains in air, and 1511] grains in water. 



25. A lump of ice weighing 8 Ibs. is fastened to 16 Ibs. of lead. 

 In water the lead alone weighs 14.6 Ibst while the lead and ice weigh 

 13.712 Ibs. Find the'specific gravity of the ice. 



26. Apiece of lead weighing 600 g., weighs 545 g. in water and 

 557 g. in alcohol, (a.) Find the sp. gr. of the lead ; (6) of the 

 alcohol, (c.) Find the bulk of the lead. 



27. A person can just lift a 300 pound stone in the water ; what 

 is his lifting capacity in the air (specific gravity of stone = 2.5) ? 



In the next three examples, the weight of the empty flask is not 

 taken into account. 



28. A liter flask holds 870 g. of turpentine ; required the sp. gr. 

 of the turpentine. 



29. A liter flask, containing 675 g. of water, on having its remain- 

 ing space filled with fragments of a mineral, was found to weigh 

 1487.5 g.; required the specific gravity of the mineral. 



30. A liter flask was four-fifths filled with water ; the remaining 

 space being filled with sand the weight was found to be 1350 g. ; 

 required the specific gravity of the sand. 



31. A weight of 1000 grs. will-sink a certain Nicholson's hydrom- 

 eter to a mark on the rod carrying a pan. A piece of brass plus 40 

 grs. will sink it to the same mark.v W T hen the brass is taken from 

 the pan and placed in the basket, it requires 160 grs. in the pan to 

 sink the hydrometer to the same mark on the rod. Find the specific 

 gravity of the brass. 



32. A Fahrenheit's hydrometer, which weighs 2000 grs., requires 

 1000 grs. in the pan to sink it to a certain depth in water. It requires 

 3400 grs. in the pan to sink it to the same depth in sulphuric acid. 

 Find the specific gravity of the acid. 



