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定義
12インチまたは正確に0.3048 mに等しいヤード・ポンド法の長さの単位。
解説
The foot was historically based on the length of a human foot, standardized by King Edward II of England in 1324 as 36 barleycorns. The international foot was defined as exactly 0.3048 m in 1959. One foot equals 30.48 cm; a 6-foot person stands 182.88 cm tall. In the US, elevation, aircraft altitude, and building floor heights are routinely expressed in feet.
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