# 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/m^{3}. 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.

**Formula**

**SG = Ï**_{object} / Ï_{W}

Ï_{object} = density of the material (kg/m^{3} or g/cm^{3})

Ï_{W} = density of the water (kg/m^{3 }or g/cm^{3})

Specific density of water is 1 kg/m^{3 }or 1000 g/cm^{3}. 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/cm^{3} and the density of water is 1000 g/cm^{3}.

Ï_{object} = 28,000 g/cm^{3}

Ï_{W} = 1000 g/cm^{3}

**Step 2:**^{ }Substitute the values in the formula to find the relative density of the given object.

SG = Ï_{object} / Ï_{W}= 28,000 / 1000

Specific gravity / Relative Density =28

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