They be arbitrary, but at least SI units are logically scaled. 1 km is 1000 m. Unlike miles to feet, which have no logical scaling. Related picture: https://i.

They be arbitrary, but at least SI units are logically scaled. 1 km is 1000 m. Unlike miles to feet, which have no logical scaling. Related picture: https://i.imgur.com/MQ7LVC3.jpg https://i.imgur.com/MQ7LVC3.jpg