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Carbon dioxide in a finished beer may come from

  • A.The hops that were added during the boiling of the wort
  • B.The husks of the barley left behind in the mash tun
  • C.The kilning of the malt before it is milled and mashed
  • D.The fermentation itself or from later carbonation

Answer: D

Traditionally the gas of a secondary or conditioning fermentation is retained under pressure, and in modern practice carbon dioxide is often added to a filtered beer instead. Both routes give the same gas from a very different origin.

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