"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 on the hydrometer is no longer valid.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