Oz is the abbreviation of symbol ounce, which means ounce in Chinese. It is both a weight unit and a length unit. The length unit 1oz represents that the copper foil thickness of PCB is about 36um. \x0d\ Weight units are divided into two types: constant scale and gold scale. \x0d\ (1) The unit of mass in the constant system [ounce (abbreviated as oz)] was translated from English Ounce and then from Hong Kong into Anshi. British unit of weight measurement. It's one sixteenth of a pound. Formerly known as Liang Ying or _ The symbol is ounces or ounces, which is equal to 28.3495 grams. (2) A unit of mass in a drug or gold balance system, equal to 480 grains or 3 1. 1034768 grams. Equivalent to 1 2 of China's past 16 systems. \x0d\ length unit \x0d\ length unit, 1oz means that the copper foil thickness of PCB is about 36um, which comes from tiling pure copper with the weight of 1oz and the density of 8.9g/cm^3 to 1 square foot (= 144 inch).