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.
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Dimensional analysis.
Dimensional analysis
Production for five people was as follows: 8 units, 11 units, 6 units, 12 units, 8 units. What was their average production in units?
117 units
11.5