The meter is the base unit of length in the International System of Units (SI), making the nanometer a derived unit used primarily to measure the atomic and molecular scale of materials and the ...

An angstrom (Å) is a unit of length equal to 10-10 meters or 0.1 nanometers ... for consistency with older literature and ease of use when discussing atomic-scale structures. In crystallography, ...

NASA has given a first look at a full-scale prototype of the telescopes that ... measure precise distances — down to trillionths of a meter, or picometers — between a trio of spacecraft.