I am trying to determine the alcohol content in my wine using this
250 mL original SG=1,000 boiling down to half the volume and
reconstitute to its original volume with water. Final SG=1,017.
On the reference web page the alcohol content shall be calculated like
On another web page
there is a table saying that the alcohol vol% for the SG difference of
17 (actually 0,017 converted to "Spirit Indication by multiplying with
1000)should be 13,2 vol%. This table is also quoted on
rec.crafts.winemaking FAQ (http://216.162.125/winemaking_faq.html).
The alcohol % derived from the tables looks much closer to the
expected value going by must initial gravity.
However, when I try to set up the equations for calculating the vol%
alcohol I come to the same equation as the first one quoted and
calculate 8,05% !!!
Does someone know which is the right calculation method and why there
are two different methods around for the same procedures? And does
somebody know how the numbers in the tables are calculated?
- posted 15 years ago