Question

what is the Smallest unit used to measure length?​

Answer 1

Answer:

millimeters

The millimeter is the smallest commonly used unit in the metric system. The abbreviation for millimeters is mm (for example, 3 mm). A millimeter would be used to measure something that is very small, like a seed. The centimeter is the next smallest unit of measurement.

Answer 2

Answer:

Fentometre (fm) is the smallest unit used to measure length. Its value is 10^-15 metres. It is very commonly used by scientists to measure the size of atoms, protons, molecules, etc.