How to Calculate Specific Gravity?

How do you find specific gravity of a substance?

Specific Gravity Step by Step Calculation

Specific gravity is a dimensionless quantity. It is a measure of ratio of density of a substance to the density of water at 4 degrees Celsius. It can be represented as sp gr. and can also be termed as relative density. Specific density of the water is 1000 kg/m3. If the substance referred has specific gravity less than 1, then its less denser than water and if greater than 1, more denser than the water.
Relative Density Of An Object Calculation
SG = ρobject / ρW
ρobject = density of the material (kg/m3 or g/cm3)
ρW = density of the water (kg/m3 or g/cm3)

Specific Gravity Formula
Specific density of water is 1 kg/m3 or 1000 g/cm3. Substance referred in the numerator and denominator always holds the same unit. Thus, relative density doesnt have any unit.
Step 1: Consider an example, the density of the object is 28,000 g/cm3 and the density of water is 1000 g/cm3.
ρobject = 28,000 g/cm3
ρW = 1000 g/cm3
Specific Gravity Step 1
Step 2: Substitute the values in the formula to find the relative density of the given object.
SG = ρobject / ρW
= 28,000 / 1000
Specific gravity / Relative Density =28
How To Calculate Specific Gravity Step 2

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