questionswhat is the cloud that forms at the top of…

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Actually, it is water vapor. The release of the carbonation into the air causes the liquid surface to cool. Water vapor in the vicinity is cooled as well and so condenses.

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@nortonsark: So it's not tiny little Who-verses that come in & out of existence in a blink of an eye?

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CO2 and the water vapor it carries into the air above the fluid surface...