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千分尺,通常也被稱為一微米,長度是等於一米(SI標準前綴“微”= 10-6)的1×10-6的SI衍生單元; 即百萬分之一米(或千分之一毫米,0.001毫米或約0.000039英寸)。
The metre (international spelling) or meter (American spelling) (from the Greek noun μέτρον, "measure") is the base unit of length in the International System of Units (SI). The SI unit symbol is m. The metre is defined as the length of the path travelled by light in a vacuum in 1/299 792 458 seconds.