Editing Measurement (section)

=== Imperial and US customary systems ===
{{Main|Imperial and US customary measurement systems}}
Before [[SI unit]]s were widely adopted around the world, the British systems of [[English unit]]s and later [[imperial unit]]s were used in Britain, the [[Commonwealth of Nations|Commonwealth]] and the United States.  The system came to be known as [[U.S. customary units]] in the United States and is still in use there and in a few [[Caribbean]] countries.  These various systems of measurement have at times been called ''foot-pound-second'' systems after the Imperial units for length, weight and time even though the tons, hundredweights, gallons, and nautical miles, for example, have different values in the U.S. and imperial systems. Many Imperial units remain in use in Britain, which has officially switched to the SI system, with a few exceptions such as road signs, where road distances are shown in miles (or in yards for short distances) and speed limits are in miles per hour. Draught beer and cider must be sold by the imperial pint, and milk in returnable bottles can be sold by the imperial pint. Many people measure their height in feet and inches and their weight in [[Stone (imperial mass)|stone]] and pounds, to give just a few examples. Imperial units are used in many other places: for example, in many Commonwealth countries that are considered metricated, land area is measured in acres and floor space in square feet, particularly for commercial transactions (rather than government statistics). Similarly, gasoline is sold by the gallon in many countries that are considered metricated.