I have a wine that appears to have reached 0.992 SG (so in theory should be ready to bottle), but am concerned that my SG reading could be an underestimate because I took the sample from near the top of the carboy. When moving the vessel to prepare for filtering, bubbles emerged from the airlock.
When measuring the SG of wine, a wine thief only reaches an inch or so below the liquid surface.
Since a dense liquid (higher SG) sinks beneath a less dense liquid (lower SG), does this mean that measurements taken from the top of a carboy potentially underestimate SG of the vessel as a whole? Or can it be assumed that the entire vessel is at the same SG? This is a 7 gallon carboy.