How thick is a mil?

As in a millimetre or a milliletre
if your talking millimetre.
get your ruler
fine from 0 to 1cm
so say 0|1cm
the distance from one line to another is a millimetre

Answer:
A "mil" is an old style measurement still used in the USA. It is equal to 1/1000 of an inch. It is used in the American wire gauge (AWG), or Brown & Sharpe wire gauge, as a standardized system for the diameters of round, solid, nonferrous, electrically conducting wire.