The atomizer does not have a ml volume???
The atomizer is the coil and coil-wick and transfer-wick which can hold roughly 0.25ml of fluid within the wick, for vaporization.
The
juice cartridge contains the majority of the liquid, and holds between 0.5 to 1.5 ml of fluid. (Stuffing/wick consumes a portion of the true 1.0 to 2.0 ml volume.)
A 10ml bottle of liquid is roughly the size of an eye-dropper bottle.
For concentration of nicotine...
You will see...
20mg which is 20mg of nicotine per 1ml of fluid volume.
15mg which is 15mg of nicotine per 1ml of fluid volume.
10mg which is 10mg of nicotine per 1ml of fluid volume.
etc...
LOL, metric is the new american standard... Just like "Automatic" is the new american standard vehicle production. (Standard once was "Manual shifting", now the standard is "Automatic shifting".)