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.
Read full nanometer reference โThe statute mile equals 1609.344 meters exactly since the 1959 international definition. It is the official road unit in the United States, United Kingdom and Myanmar. The name comes from the Latin "mille passuum" โ one thousand Roman paces. The nautical mile (1852 m) is different and used only in marine and air navigation.
Real-world: London to Edinburgh is about 400 miles by road. A marathon is 26.22 miles. US highways typically post 65โ75 mph speed limits.
Read full mile reference โ