苏打水

Soda water \So"da wat`er\, n.
1. originally, a beverage consisting of a weak solution of
sodium bicarbonate to which an acid (such as phosphoric
acid) has been added to generate carbon dioxide and thus
cause effervescence; the term now is also used as a
synonym for {soda pop}. Soda water without flavoring is
used as a beverage or as a component of a mixed beverage.
It is typically bottled or canned under pressure so that
the carbon dioxide and effervescence will be preserved
until use.
[PJC]

2. a beverage containing supersaturated carbon dioxide
(carbonic acid) and thus effervescent.
[PJC]

3. same as {soda pop}.
[PJC]