The distance between two objects or places is measured as length.
The standard unit of length according to the metric system is meter (m).
Based on the length that needs to be measured, meter can be converted into different units like millimetre (mm), centimetre (cm) and kilometre (km).
• 1 km = 1000 m
• 1 m = 100 cm
• 1 cm = 10 mm
For example the length of a pencil is measured in centimetres, while the distance between two places is measured in kilometres.
The other units of measurement of length are inches, feet, yard and miles. In the United States these measuring units are used.