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nmNanometer
The nanometer equals one billionth of a meter. Visible light spans 380โ700 nm. Modern semiconductors are manufactured on 3โ5 nm process nodes. Gold atom diameter is 0.29 nm. The nanometre is the natural scale for atomic physics and nano-engineering.
Real-world: Visible light is 380โ700 nm. Apple's A17 Pro chip uses a 3 nm process. The DNA double helix is 2 nm wide.
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