Drinking carbonated water has been in vogue since at least 1767, and it doesn't seem to be going anywhere. So what gives us our taste for the sparkling stuff?
It's still not clear what characterizes the sensation of carbonation. People assume carbonation is the feeling of bubbles popping on the tongue, but when people drink carbonated beverages in a pressure chamber, where bubbles don't burst, they describe it the same way. So it's not purely mechanical.
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Even if the bubbles don't actually pop, you can still feel them on the tongue - like little beads. There are Asian iced teas served with gelatin balls floating in them - probably the same sensation seeking there... the feeling of things on the tongue is fun, even if there is no added nutritional value.
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