描述: 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。

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该术语及其定义的译文仍待审核

The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".

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