1mm (millimeter) is a unit of measurement used to express small distances, typically in the range of fractions of an inch. It is equal to 0.03937 inches or approximately 0.04 inches. In terms of thickness, 1mm is very thin, roughly equivalent to the thickness of a credit card or a sheet of paper. For comparison, the average human hair is around 100 microns (0.1mm) thick, which is 10 times thinner than 1mm.
