Short Black Haired Girl Having A Bubble Bath With A 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.
Bath fizzies are infeasible as liquids because of the inability to keep the mixture from reacting prematurely. This is a distinction from foam bath preparations, which may be supplied as liquids or solids.
When the term "bubble bath" is encountered on the Internet referring to a gas-infused bath or pool, it is more often by a non-native user of English who may not be aware of its use to refer to foam baths. In other languages the distinction is more likely to be kept by use of different words.