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Carbonation is created in the package
Yeast consumes a measured amount of fermentable sugar and produces carbon dioxide that stays trapped in the sealed bottle.
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Beer packaging · Bottle conditioning
Bottle conditioning: when fermentation continues after packaging.
Bottle-conditioned beer contains live yeast and enough fermentable material for a controlled secondary fermentation in the bottle. That naturally creates carbonation and can keep the beer developing after packaging.
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Live yeast remains
A small yeast sediment is normal in many bottle-conditioned beers.
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Control matters
Too much fermentable material or unfinished primary fermentation can create dangerous excess pressure.
Why bottle-condition instead of force-carbonating?
Natural refermentation can create fine carbonation, support long-lived styles and suit breweries that want the beer to continue evolving in package. It is a process choice rather than a universal quality upgrade.
Why is there sediment?
Yeast settles after conditioning, often forming a compact layer at the bottom. You can pour carefully for a clearer glass or include some yeast if the style and producer encourage it.
Does bottle conditioning make beer age better?
Sometimes. Live yeast and slow development can suit certain Belgian, strong or mixed-fermentation beers, but freshness still matters and not every conditioned beer benefits from long storage.
Why is package pressure taken seriously?
Conditioning creates carbon dioxide inside a sealed container. Brewers have to know fermentation is under control and calculate additions carefully so pressure stays within the package’s limits.
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