18 fl oz=
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A Customary Unit or non-SI unit is a measurement unit that is not part of the metric system. Customary units are mainly units of the Imperial system but they could be localised customary units - such as Gaj (for area) is South Asia.
using classical rather than metric units of measurement
It is a customary unit.
The pound is NOT a metric unit.
In the SI system (metric), length is a meter, mass is the kilogram, and time is the second.