Question

People use a variety of methods to wash cloth. Usually, after adding soap,they 'beat' the clothes on a stone or beat it with a paddle scrub with a brush or agitate the mixture in a

washing machine .Why is this agitation neccessary to get clean clothes?

Answer 1

There are two parts in a soap molecule - hydrophobic and hydrophilic. Soap molecules attach themselves to the grease or dirt particles with the help of these and form a cluster called micelle. The micelles remain suspended as a colloid. It is necessary to agitate the clothes in order to remove these micelles which have entrapped the dirt.

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