Nanometer

An ångström is smaller than a nanometer.

Source: tatoeba (483714)

A nanometer, or nano, is one-thousand-millionth of a meter. This is about the size of atoms and molecules. Nanotechnologists work with materials this small.

Source: tatoeba (11131100)

How small is a nanometer? Strictly speaking, it's a billionth of a meter. To put things in perspective, comparing a nanometer to a meter is about the same as comparing a marble to the size of the earth. Weckert, a fellow at Canberra's Centre for Applied Philosophy and Public Ethics, says the reason ethical issues arise is that scientists and the general public are struggling to understand both the benefits and the risks of nanotechnology.

Source: tatoeba (12250686)

We live our lives in three dimensions for our threescore and ten allotted years. Yet every branch of contemporary science, from statistics to cosmology, alludes to processes that operate on scales outside of human experience: the millisecond and the nanometer, the eon and the light-year.

Source: wiktionary