Fermentation
Yeast turning grape sugar into alcohol.
Unofficial study resource · not affiliated with or endorsed by WSET®Definition
Fermentation is when yeast turns the sugar in grape juice into alcohol and carbon dioxide. It is the core step that turns juice into wine. If all the sugar converts the wine is dry; stopping early leaves sweetness.
Why it matters for WSET
Fermentation is the starting point of every wine and decides its sweetness and style, a foundation across the WSET syllabus.
Example
Stopping fermentation early leaves sugar behind, making a sweet wine.
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