Convertir span (cloth) en mètre

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Vice versa: mètre en span (cloth)

Span (Cloth)

A cloth span is a traditional unit de longueur égal à 9 inches (approximativement 0.2286 metres), representing half an English ell and à l'origine basé sur the span of the human hand from the tip of the thumb to the tip of the little finger lorsque fully extended. Il était widely utilisé en the textile trade for measuring cloth and fabric. Like many body-based units, the span varied across cultures, but the English cloth span of 9 inches became a recognised standard in British commerce. 


mètre

La metre (Commonwealth spelling and BIPM spelling) or meter (American spelling) (from the French unit mètre, from the Greek noun μετρούν, "measure") is the unité de base de longueur dans le Système international d'unités (SI) (SI). The unité SI symbol is m. Le mètre est défini comme the length of the path travelled by light in a vacuum in 1/299,792,458 of a second.

Le mètre was à l'origine defined in 1793 as one ten-millionth of the distance from the equator to the North Pole along a great circle, so the Earth's circumference is approximativement 40000 km. In 1799, the metre was redefined in terms of a prototype metre bar (the actual bar used was changed in 1889). In 1960, the metre was redefined in terms of a certain number of wavelengths of a certain emission line of krypton-86. In 1983, the current definition a été adopté. 


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