Description : Detergents clean surfaces on the principle of – (1) viscosity (2) surface tension (3) elasticity (4) floatation
Last Answer : (2) surface tension Explanation: Detergents and soaps are used for cleaning because pure water can't remove oily, organic soiling. Soap cleans by acting as an emulsifier. Basically, soap ... and World War II. Detergents are primarily surfactants, which could be produced easily from petrochemicals.