Is it possible to make nanometers or angstrom a default unit to work with? I'm trying to make nanotube models and molecules in Blender but I'd prefer if I can work with the defaulted units as nm or angstroms.
See: https://docs.blender.org/manual/en/dev/data_system/scenes/properties.html?#units

That is the official explanation of units in blender and how to change them.