The ounce is a unit of mass but it can also be used as a unit of volume. It is not a standard international unit. A standard unit of mass is kilogram and unit for volume is cubic metres. 1000 L = 1 m3
There are 8 basic units of measurement in the International System of Units. Length with a unit of metres, m Mass with a unit of kilograms, kg Luminosity with a unit of Candela Time with a unit of...
It means what quality or units. Length, weight, density, speed, brightness, humidity etc. or units; Feet, Metres, Kilogrammes, cubic miles, degrees, or just simple numbers, i.e. "There are 6 trees"...
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