yeast and aeration

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Ol' Grog

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When we aerate for the yeast, are we talking about getting it enough O2 to take off? I mean, yeast don't need O2 for the whole fermenting cycle, do they? Thought this was a anaerobic process.
 
Ol' Grog said:
When we aerate for the yeast, are we talking about getting it enough O2 to take off? I mean, yeast don't need O2 for the whole fermenting cycle, do they? Thought this was a anaerobic process.

Yeah, it's primarily for the yeast to get started, after a couple of days (3-4, I think) the process becomes anerobic. I'm no expert, but I learned a ton about this and other science-of-beer stuff from Randy Mosher's Homebrewer's Companion.

Focus
 
O2 is needed for the yeast to grow & multiple. Once the O2 is gone, the yeast switch to anerobic processing of sugar to alcohol & CO2.
 
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