Unit 4 Measurements

• Millimetre, centimetre, metre and kilometre are the standard units for length. 
• To read the measurement accurately, the eyes must be level with the mark to be read.
• Square millimetre, square centimetre, square metre and square kolimetre are the standard units for area.
• The area of a square or rectangle can be calculated by multiplying the length and the width.
• Cubic millimetre, cubic centimetre, cubic metre are the standard units for volume.
• The volume of a cube or cuboid can be obtained by multiplying the length, the width and the height.

• Millilitres and litres are standard units for volume of liquids.
• The eyes should be level with the bottom of the meniscus when taking the volume reading.
• Milligram (mg), gram (g) and kilogram (kg) are metric units used to measure mass.
• Processes that repeat uniformly can be used to measure time.
• The standard units for time are second, minute and hour.
• Standard units are needed for accuracy and consistency.