People use a variety of methods to wash clothes. Usually after adding the soap, they ‘beat’ the clothes on a stone, or beat it with a paddle, scrub with a brush or the mixture is agitated in a washing machine. Why is agitation necessary to get clean clothes?
Molecules of soap form micelles with dirt, such as grease. Micelles remain suspended as colloid. To remove dirt in the form of micelles from clothes agitation is necessary to get clean clothes.
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