spscific gravity

    spscific gravity 

spscific gravity  :-

is the ratio between the  weight of a 

mineral anan 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

                

            measuring specific gravity

spscific gravity is the ratio between the weight 

of a substance and an equal of water .

to measure spscific gravity , 

first weight a substance in air in fig. above left

and then weight in water in fig.above right ,

spscific gravity  :-is the weight of substance in 

air , divided by the difference between its 

weight in air and its in weater.