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Sparkling and semi-sparkling wines closure

What makes the difference among still, semi-sparkling (Frizzante) or sparkling (Spumante) wine is substantially the different quantity of carbon dioxide (CO2) dissolved in the wine: the bubbles.
According to Italian legislation, a wine is defined still if the overpressure is less than 1 atmosphere (bar), semi-sparkling if it is included in a range from 1 to 2.5 bar and sparkling wine if it exceeds 3.5 bar.

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