specific gravity

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 specific gravity  

 specific gravity                                           specific   gravity  :- is the ratio between the  weight of a mineral and an equal volume of water .

it is based on Archimeds principle which states that any substance weighs less in a fluid than it does in water and that the lost weight is the equivalent of the fluid it displaces .

if you a smple of gold weighing say  100 grams it will weigh about 94.82 grams when immeresd in water .

the weight lost is 5.18 grams

specific gravity of gold =100 ÷5.18

                                     =19.3

it means the gold is 19.3 times as heavy as the same volume of water 

the specific gravity  of minerals ranges from 1 to23

but the average for all minerals is only aboyt 2.6

 to measure specific gravity :-

1- weight a specimen in air .

2- then weight it in weater .

the specific gravity is the weight a specimen in air divided by the difference between its weight in air and its weight in weater

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