80 



APPLIED SCIENCE 



stop on the even keel, but will roll some distance the other 

 way, and will continue to oscillate about its mean position 

 for some time. 



80. Specific Gravity. The specific gravity of a substance 

 is the number of times it is heavier than the weight of an equal 

 bulk of water. It may be expressed thus: 



Specific gravity (sp. gr.) = 



Weight of body or substance 

 Weight of an equal bulk of water 



The specific gravity of a solid is obtained by first weighing 

 or computing the weight of the object. The weight of an 

 equal bulk of water is then computed. Finally, the weight 

 of the object is divided by the weight of the equal bulk of 

 water. 



The following tables show the weights and specific gravi- 

 ties of the most important metals and liquids. 



WEIGHT AND SPECIFIC GRAVITY OF METALS 



