As the Laws were formulated in England, and were initially administered solely by the four British football associations within IFAB, the standard dimensions of a <answer>football pitch</answer> were originally expressed in imperial units. The Laws now express dimensions with approximate metric equivalents (followed by traditional units in brackets), though use of imperial units remains popular in English-speaking countries with a relatively recent history of metrication (or only partial metrication), such as Britain.
Imperial units where once used to express the dimensions of a what?
football pitch