Foot (unit)
International foot

The international yard and pound agreement of July 1959 defined the length of the international yard in the United States and countries of the Commonwealth of Nations as exactly 0.9144 meters. Consequently, since a foot is one third of a yard, the international foot is defined to be equal to exactly 0.3048 meters. This was 2 ppm shorter than the previous US definition and 1.7 ppm longer than the previous British definition.

The 1959 agreement concluded a series of step-by-step events, set off in particular by the British Standards Institution 's adoption of a scientific standard inch of 25.4 millimeters in 1930.
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