Ancient Greeks developed sophisticated units of measurement ranging from measuring length, distance, volume, and weight of solids and liquids ...

Other units are based on these basic units but have a prefix in front. The prefix tells you how much bigger or smaller the unit is: ...

For example, speed (quantity) is measured in metres per second. that can be measured. A unit of measurement is one unit of a quantity: for example, one second. Standard units of measurement are ...

Metric measurements — also known as the International ... with a little rainbow wheel showing all the approved SI basic units — from meter and kilogram right on through second, kelvin, ampere ...