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Old 12-04-2009, 05:19 AM   #1
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Default Taking a gravity reading = oxygen into the wort?

Third batch ever. I have it in secondary, and have checked the gravity twice, so that I'll know when it's ready to bottle. I'm using a wine thief to take a sample, which means I have to take off the stopper of the carboy. Doesn't this release all the CO2 and introduce oxygen?

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Old 12-04-2009, 05:21 AM   #2
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Third batch ever. I have it in secondary, and have checked the gravity twice, so that I'll know when it's ready to bottle. I'm using a wine thief to take a sample, which means I have to take off the stopper of the carboy. Doesn't this release all the CO2 and introduce oxygen?
CO2 is heavier than Oxygen so there should be a protective blanket on top of the beer.
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Old 12-04-2009, 05:23 AM   #3
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No. CO2 is denser than air, so unless you really disturb the fermentor the amount of O2 that will make it through the CO2 blanket is nothing to worry about.

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Old 12-04-2009, 05:24 AM   #4
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And even if you do get a bit of O2 in the beer, it will still turn out fine. Honestly, beer is pretty resilient stuff, and it takes a lot of effort to screw it up badly.

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