# Unit of Density

Before we get in the unit of density, let’s quickly go through what density is. Well, the density of a substance is basically its mass per unit volume. It is represented by the symbol ρ or it can also simply be represented by letter D. Density can also be defined mathematically as mass divided by volume. So we get the formula;

where ρ is the density, m is the mass, and V is the volume.

## SI Unit of Density

Each substance has a specific density. Generally, the density of water (which is approximately about 1 gram/cubic centimetre) is taken as the standard value for calculating the density of substances. However, the SI unit of Density, it is measured using kilogram per cubic metre (kg/m3).

### Other Density Units

Talking about other density units, metric tons and litre are also used even though they are not part of the SI. Some of the other units include;

• gram per millilitre (g/mL)
• metric ton per cubic metre (t/m3)
• kilogram per litre (kg/L)
• megagram (metric ton) per cubic metre (Mg/m3)
• gram per cubic centimetre (g/cm3)
1 g/cm3 = 1000 kg/m3
• kilogram per cubic decimetre (kg/dm3)

In addition to this, in the cgs system density is measured in gram per cubic centimetre (g/cm3).

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#### Practise This Question

Find the number of significant figures in the given data
P) 0.543U) 3Q)4.330V) 4 R)1.32×102W) 5S) 0.002X) 1