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Glossary term: Nanometer

Description: One nanometer is one-billionth of a meter. Its symbol is nm. A human hair is approximately 80,000–100,000 nm wide, about the same as the thickness of a piece of paper. A strand of human DNA is about 2.5 nm in diameter. A water molecule is less than 1 nm across. The wavelength of visible light can be measured in nm. Typically, the human eye can detect wavelengths from 380 nm (violet) to 700 nm (red).

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Term and definition status: This term and its definition is still awaiting approval

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".