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The primary unit of metric volume is the liter (L).
Kilogram
Primary sampling is a research method used by various companies for many different reasons. The primary sampling unit arises in sampling surveys where population elements are grouped, and those groups becomes units in the sample selection.
Immediatly de-energize the unit
Unit process includes all the treatment methods in which the removal of contaminants is brought about by chemical or biological reactions. it is considered as a secondary treatment . while Unit Operation involves only the methods in which physical forces predominates. it is considered as primary treatment.