Description: 一纳米是一米的十亿分之一。它的符号是 nm。一根人类头发的宽度与一张纸的厚度差不多约，为 80,000-100,000 纳米。人类 DNA 链的直径约为 2.5 纳米。一个水分子的直径不到 1 纳米。可见光的波长可以纳米为单位测量。通常情况下，人眼可以检测到波长在 380 纳米（紫光）到 750 纳米（红光）之间的光。

Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher
The translation of this term and its definition is still awaiting approval

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