In physics and mathematics, a nanometer (nm) is a unit of spatial measurement that is exactly one billionth of a meter. It is widely used to measure extremely small things, such as the wavelength of visible light, the size of molecules, and atomic structures.
1 nanometer is exactly one-billionth of a meter.
Visible light has wavelengths ranging from roughly 400 nm to 700 nm.
A typical strand of human DNA is about 2.5 nm in diameter.
The prefix 'nano' means $10^{-9}$. Therefore, 1 nanometer is equal to $10^{-9}$ meters.
There are exactly 1 billion (1,000,000,000 or 10^9) nanometers in 1 meter.
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