Density

Density is the mass per volume of a substance. It is denoted by the formula D=M/V

Density (D) = (mass (M))/(volume (V))

OR

It is the mass per unit volume of a body. The unit for density is g/cm3 or kg/m3. Density is a derived quantity because its units are combinations of two base units, thus, mass (M) and volume (V).

Density differs with every substance. Every substance has different densities because the particles that make them up are packed more closely. It is very important to know density of substances. The density of pure liquid is 1g/cm3. Calculating the density of regular and irregular objects has been discussed in the previous lesson.

Tips: for regular objects

• Find the mass of the using the balance

• Find the volume of the object by measuring their dimensions and calculating them. E.g. formula for rectangle = L × B × H

Tips: for irregular objects

• Find the mass of the using the balance

• Find the volume of the object by using the displacement method.

After getting the mass and the volume of the regular and the irregular objects, calculate the density using Density (D) = mass (M) / volume (V)