Calculation Of Specific Gravity:-
The Specific Gravity (it is also written as sp.gr.) of a substance is the ratio
of the weight of a given volume of the substance to the weight of an equal
volume of some standard substance (which is taken as water at 4degreeC)
Obviously it is a pure number and processes no dimensions.
Hence the Specific gravity of a substance
=(the weight of volume
v of the substance)/(the weight
of volume v of the standard substance)
=(the weight of a unit volume of the substance)/(the weight
of a unit volume of the standard substance)
=(the mass of a unit volume of the substance)/(the mass of a
unit volume of the standard substance)
(as weight=mass*g)
=(the density of the substance)/(the density of standard
substance)
This is the final step for Specific Gravity.
True specific gravity can be expressed mathematically as:
The apparent specific gravity is simply the ratio of the weights of equal volumes of sample and water in air:
It can be shown that true specific gravity can be computed from different properties:
where
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