Short Black Haired Girl Having A Bubble Bath With A Foam

The term bubble bath can be used to describe aerated or carbonated baths, or to describe bathing with a layer of surfactant foam on the surface of the water and consequently also the surfactant product used to produce the foam.
Aerated and carbonated baths – bubbles in water
Bubbles in the water can be produced either by aerating it mechanically (in some cases using jets that also move the water) using equipment installed permanently or temporarily in a bathtub, hot tub, or pool, or by producing gas in the water in a bathtub through the use of effervescent solids. The latter can come as small pellets known as bath fizzies or as a bolus known as a bath bomb, and they produce carbon dioxide by reaction of a bicarbonate or carbonate with an organic acid.