A bath bomb, one form of bath fizzies, is a bolus which, when placed in bath water, dissolves partly or completely and effervesces, also in some cases adding scent, color, and/or other properties or materials to the water. Bath bombs are composed primarily of sodium bicarbonate and/or other soluble carbonate, sesquicarbonate, or bicarbonate, and citric acid and/or other organic acid, which create an acid-base 'fizzing' when the solid reacts with water as it dissolves, producing carbon dioxide gas and strewing its interior contents, which can include aromatic elements or possibly small fragments of sparkling glitter, into the bath. It depends on the size and brand of the bath bomb for how long it takes to dissolve.

An average bath bomb takes about 2 minutes to dissolve. Bath bombs come as a large single-use tablet or ball, distinguished from other fizzies which come as grains. The bubbles tickle as they nucleate on, and then release from, the skin and hair of the bather.

Bath bombs may be considered therapeutic to the extent they contain essential oils to help a bather become energized or calm, such as mint or lavender. They can also contain cleansing agents like sea salt or surfactants.

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