SPECIFIC GRAVITY. 



141 



liquids, as acids, alcohols, milk, solutions of sugar, etc., 

 than their specific gravities proper. According to their 

 uses they are known as acidometers, alcoholometers, lac- 

 tometers, saccharometers, etc. They all depend upon the 

 principle that a floating body will displace its own weight 

 of the liquid upon which it floats, and, consequently, a 

 greater volume of light than of heavy liquids. 



253. Tables of Reference* (1.) Specific gravities 

 of some solids : 



Indium 23.00 j Brass 8.38 



Platinum 22.069 Iron (bar) 7.78 



Gold (forged)... 19. 36 ' 



Lead (cast) 11.35 



Silver (cast).... 10. 47 



Marble (statuary). 2. 83 

 Anthracite Coal. .1.80 



Tin (cast) 7.29 ' Bituminous Coal. 1.25 



Iron (cast) 7.21 ! Ice (melting) 92 



Zinc (cast) 6.86 j Pine 65 



8.79 I Flint Glass 3.33 ! Cork 24 



Copper (cast). . 



(2.) Specific gravities of some liquids: 



Mercury 13.6 



Sulphuric Acid. . 1.84 

 Hydrochloric Acid 1.24 



Nitric Acid 1.22 



Milk 1.03 



Sea Water.. ..1.026 



Turpentine 87 



Alcohol 8 



Ether.. . .72 



(3.) Specific gravities of some gases: (Barometer = 760 

 mm. ; Temperature = 32 F. or C.) 



Am STANDARD. 



Hydroiodic Acid 4.41 



Carbon Dioxide 1.52 



Oxygen 1.1 



Air 1.0 



Nitrogen.. 97 



Hydrogen 069 



HYDROGEN = STANDARD. 



Hydroiodic Acid 64 



Carbon Dioxide 22 



Oxygen 16 



Air 14.5 



Nitrogen 14 



Hydrogen 1 



Note. The weight of a cubic foot of any solid or liquid is equal 

 to 62.421 Ibs. avoirdupois multiplied by its specific gravity. 



The weight of a cubic centimeter of any solid or liquid is equal 

 to 1 gram multiplied by its specific gravity. 



The weight of a liter (or cu. dm.) of any solid or liquid is equal 

 to 1 Kg. multiplied by its specific gravity. 



The tables above give only average densities. Any given speci- 

 men may vary from the figures there given. 



