Bubbles on top of the water, less ambiguously known as a foam bath (see photo), can be obtained by adding a product containing foaming surfactants to water and temporarily aerating it by agitation (often merely by the fall of water from a faucet). The practice is popular for personal bathing because of the belief that it cleanses the skin [1], that the foam insulates the bath water,[citation needed] keeping it warm for longer, and (as a lime soap dispersant) prevents or reduces deposits on the bath tub at and below the water level [citation needed](called "bathtub ring" and soap scum, respectively) produced by soap and hard water. It can hide the body of the bather, preserving modesty or, in theatre and film, giving the appearance that a performer who is actually clothed is bathing normally.[1] Children find foam baths particularly amusing, so they are an inducement to get them into the bathtub.

Bubbles on top of the water, less ambiguously known as a foam bath (see photo), can be obtained by adding a product containing foaming surfactants to water and temporarily aerating it by agitation (often merely by the fall of water from a faucet). The practice is popular for personal bathing because of the belief that it cleanses the skin [1], that the foam insulates the bath water,[citation needed] keeping it warm for longer, and (as a lime soap dispersant) prevents or reduces deposits on the bath tub at and below the water level [citation needed](called "bathtub ring" and soap scum, respectively) produced by soap and hard water. It can hide the body of the bather, preserving modesty or, in theatre and film, giving the appearance that a performer who is actually clothed is bathing normally.[1] Children find foam baths particularly amusing, so they are an inducement to get them into the bathtub.