**MEASURING VOLUME:**

The volume of an object is the measurement of the amount of space it occupies. It is measured in cubic meters (m^3) or cubic centimeters (cm^3). The volume of regular shaped solids is found using a ruler and mathematical formulae. For example, the volume of a rectangular block is found using the equation: length X breadth X height. The volume of liquid can be found by pouring it into a measuring cylinder. The volume of an irregular shaped solid is measured by displacement as in the diagram.

**MEASURING DENSITY:**

Objects which are the same size and shape can vary greatly in mass. For example, one cubic centimeter of cork is much lighter than a cubic centimeter of lead. This is because the materials have a different density. Molecules of lead are heavier and more closely packed together than those of cork. This makes lead a more dense material than cork.

To find the density of a solid or a liquid its mass and volume must be measured using the methods described above.

These quantities are used in the equation:

Density (D) = Mass (m)/Volume (v)

Density is measured in kilograms per cubic meter (kg/m^3) or grams per cubic centimeter (g/cm^3)

**MEASURING MASS:**

The mass of an object is the measure of how much matter it contains. Mass is measured in kilograms (Kg). To find the mass of an object, simple balancing scales like the ones shown are used to compare the unknown mass with a known mass.

These quantities are used in the equation:

Mass (M) = Density (D) X Volume (V)

Volume (V) = Mass (M) / Density (D)

Density (D) = Mass (M)/Volume (V)