• # question_answer Why is there a fizz when a soda water bottle is opened?

In soda water bottle, $C{{O}_{2}}(g)$ is dissolved in water under high pressure since under normal pressure the solubility of the gas is small. Now, when the bottle is opened, the pressure of the gas inside the bottle decreases. As a result, the solubility of the gas decreases. Therefore, the dissolved gas escapes from the bottle and there is a fiz.