"gene" wrote in message
t...
jim wrote:
On Nov 28, 12:00 pm, "frederick ploegman"
wrote:
"jim" wrote in message

...

Hi Gene, alcohol is definitely less dense than water, but if a wine at
1.000 is not quite dry, why do they calibrate 1.000 with 0PA? Do you
see why I think it is confusing?
Jim
The scales on a hydrometer are like a snapshot. A picture of a
moment frozen in time. That picture is of a prepitch must with
no alcohol in it. Once alcohol enters the picture, the claibration
on the hydrometer is no longer valid. HTH

Frederick

Now that makes it all coherent for me, thanks Frederick!

Are you sure about that, Frederick?

My understanding is that alcohol doesn't affect the Specific Gravity
accuracy, but it does affect the correlation to "potential alcohol" and
"degrees Brix". The more alcohol, the bigger the skew error.


snip

Yup - that's what I meant. Jim's question was about the relationship
between SG and PA and alcohol definitely "skews" that up. ;o)

Frederick