Converti span (cloth) a metro

Inserisci un valore.
Please provide a value.
Viceversa: metro a span (cloth)

Span (Cloth)

A cloth span è a traditional unit di lunghezza uguale a 9 inches (circa 0.2286 metres), representing half an English ell e originally based on the span of the human hand from the tip of the thumb to the tip of the little finger when fully extended. It era widely usato in the textile trade for measuring cloth e 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. 


metro

La metre (Commonwealth spelling e BIPM spelling) o meter (American spelling) (from the French unit mètre, from the Greek noun μετρούν, "measure") è the unità base di lunghezza nel Sistema Internazionale di Unità (SI). The SI unit symbol è m. Il metro è definito as the length of the path travelled by light in a vacuum in 1/299,792,458 of a second.

Il metro era originally definito 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 è circa 40000 km. In 1799, the metre era redefined in terms of a prototype metre bar (the actual bar usato era changed in 1889). In 1960, the metre era redefined in terms of a certain number of wavelengths of a certain emission line of krypton-86. In 1983, the current definition era adopted. 


Conversioni di unità lunghezza più comuni
Convertitori comuni