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Happened Again!

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davidgzach:
I posted a few weeks ago about an Ale that had a lower FG in a bucket than in a Better Bottle.  Same yeast, 10G split batch, all things equal.  It was chalked up to stratification during the transfer from kettle to fermenter since I filled the bucket first. 

Well, it just happened again, this time with a German Lager.  I don't remember which I filled first, but now I am wondering if there was more pressure in the headspace of the BB causing it to retain some CO2 and having that effect the hydrometer reading.  I did see some bubbles in the BB sample and none at all in the bucket sample.

Thoughts on this?

Dave

tschmidlin:
How big was the difference?  How are you aerating them?

narvin:
How are you measuring the gravity? You should degass before taking a hydrometer reading by pouring back and forth between two glasses repeatedly.

davidgzach:

--- Quote from: tschmidlin on December 29, 2012, 07:47:11 PM ---How big was the difference?  How are you aerating them?

--- End quote ---

1.012 versus 1.008.  Using a mix-stir on my cordless drill on the full 10G for 2-3 minutes.  Lot's o foam when done.

davidgzach:

--- Quote from: narvin on December 29, 2012, 08:23:31 PM ---How are you measuring the gravity? You should degass before taking a hydrometer reading by pouring back and forth between two glasses repeatedly.

--- End quote ---

Hydrometer and agreed.  I normally degass but I measured the bucket batch first (no bubbles), then the BB.  I saw the bubbles but didn't degass as I was in a rush to get out.

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