Which of the following is an example of aerated water?

Aerated water refers to water that has been infused with carbon dioxide gas under pressure, resulting in a bubbly or effervescent quality. This process not only changes the texture of the water but also adds a slight tanginess due to the formation of carbonic acid when carbon dioxide dissolves in water.

Soda exemplifies aerated water because it is often carbonated and includes various flavors and sweeteners, giving it the characteristic fizz that distinguishes it from flat beverages. The incorporation of carbonation in soda makes it a prime example of aerated water.

In contrast, still water does not contain carbon dioxide and remains flat and non-effervescent. Fruit juice is generally a non-carbonated beverage made from fruits and typically does not have the effervescence associated with aerated water. Milk, while it can have varying textures, is a dairy product that does not undergo carbonation, thus it cannot be classified as aerated water. Therefore, soda stands out as the correct answer for representing an example of aerated water.