

There are three countries that have not adopted the metric system of units yet and they are Burma, Liberia, and the US. On the other hand, mile, yard and foot are the most common units for length measurement in the customary system.

Kilometer, meter and centimeter are the most common units to measure length in the metric system. Keep in mind that the metric system and the customary system are the systems used now to measure length. Nowadays, length units differs very much between neighboring towns and cities. Throughout different civilizations and cultures, a lot of length units had been used. For sure length has the dimension of distance.

We can define the length of an object as the amount measured from one end to the other along the longest side. Length is a base element in most systems of measurement.
