"Dr. Richard E. Hawkins" > wrote in message
...
> Argh. I've *got* to find a way to calibrate my carboys to figure out
> exactly where 5 & 6 gallons are (particularly 6).
>
> After 6 gallons (an all juice batch) produced a 5 gallon + 4 bottles
> last week, last night it was 5 gallons and not much more than a bottle
> (but this was a concentrate batch).
>
> I need to find a reasonable, preferably cheap, way to figure the size.
>
> I wonder if milk is an exact measure? I do get 6 gallons at once each
> week . . .

The last I heard there was no such thing as a weights & measures _milk_
standard.

Surely someone in the Penn State chemistry or physics lab could help you
with this problem. You could either use a large graduated cylinder to fill
to 5 or 6 gallons and mark the outside of the carboy(s), or simply weigh the
carboy, both empty and full, and calculate the volume from the difference.

Tom S