The various lengths were due to parts of the human body historically being used as a basis for units of length such as the cubit, hand, span, digit, and many others, sometimes referred to as anthropic units. This resulted in the measurement of a foot varying between mm and mm in the past compared to the current definition of While the United States is one of the few, if not only, countries in which the foot is still widely used, many countries used their own version of the foot prior to metrication, as evidenced by a fairly large list of obsolete feet measurements.
Current use: The foot is primarily used in the United States, Canada, and the United Kingdom for many everyday applications. One of the earliest definitions of the inch was based on barleycorns, where an inch was equal to the length of three grains of dry, round barley placed end-to-end. Another version of the inch is also believed to have been derived from the width of a human thumb, where the length was obtained from averaging the width of three thumbs: a small, a medium, and a large one.
It is also sometimes used in Japan as well as other countries in relation to electronic parts, like the size of display screens. Definition: A foot symbol: ft is a unit of length in the imperial and US customary systems of measurement. Some of our calculators and applications let you save application data to your local computer.
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