Units of measure - AQAConverting units of volume

Units of measurement let us describe and compare length, weight, area, volume, density and other values. Units can be imperial or metric and they can be converted using conversion factors.

Part ofMathsGeometry and measure

Converting units of volume

The two cubes have the same volume.

Cube 1: 1m x 1m x1m Cube 2: 100cm x 100cm x 100cm

Cube 1

Volume = \(1~\text{m} \times 1~\text{m} \times 1~\text{m}\)

Volume = 1 m3

Cube 2

Volume = \(100~\text{cm} \times 100~\text{cm} \times 100~\text{cm}\)

Volume = 1,000,000 cm3

Since Cube 1 and Cube 2 have the same volume, \(1~\text{m}^3 = 1,000,000 ~\text{cm}^3\)

The same method can be used to convert cm3 into mm3.

Cube 1: 1cm x 1cm x 1cm Cube 2: 10mm x 10mm x 10mm

Cube 3

Volume = \(1~\text{cm} \times 1~\text{cm} \times 1~\text{cm}\)

Volume = 1 cm3

Cube 4

Volume = \(10~\text{mm} \times 10~\text{mm} \times 10~\text{mm}\)

Volume = 1,000 mm3

Since Cube 3 and Cube 4 have the same volume, \(1~\text{cm}^3 = 1,000 ~\text{mm}^3\)

The most common metric unit conversions for volume are:

  • 1 m3 = 1,000,000 cm3
  • 1 cm3 = 1,000 mm3
  • 1 litre = 1,000 ml

Example

Convert 25,000 cm3 into m3.

\(1~\text{m}^\text{3} = 1,000,000~\text{cm}^\text{3}\)

So, \(25,000~\text{cm}^\text{3} = 25,000 \div 1,000,000~\text{m}^\text{3} = 0.025 ~\text{m}^\text{3}\)