If a detergent is dissolved in water, the surface tension of water

Explanation

Soap or detergent molecules have the shape of a hairpin. When detergent is dissolved in water the heads of its hairpin shape molecules get attracted to water surface. When clothes with greasy stains are dipped in water containing detergent the pointed ends of detergent molecules get attached to the molecules of grease. So a water grease interface is formed. Thus surface tension is greatly reduced the greasy dirt is held suspended. Its area of contact with grease is increased and hence its cleaning ability is increased