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document updated 1 year, 27 days ago, on Feb 6, 2023

fabrication at smaller scales

meter m one (100) meter an adult human averages 1.7m in height, and the length from the floor to the ceiling is typically 2.4m
centimeter cm one hundredth (10-2) of a meter the width of a coffee bean, a fingernail, a thumbtack, or a pea
millimeter mm one thousandth (10-3) of a meter the thickness of a credit card, a pencil tip, or the width of a blade of grass
micrometer µm one millionth (10-6) of a meter the thickness of a bacteria, a strand of spider silk, plastic cling wrap, a human hair, or a piece of paper
nanometer nm one billionth (10-9) of a meter the thickness of a carbon nanotube, a sucrose molecule, a DNA helix, or a phospholipid bilayer
picometer pm one trillionth (10-12) of a meter roughly the thickness of a helium atom
femtometer fm one quadrillionth (10-15) of a meter roughly the diameter of a neutron

Or see these for an overview: