I found this information that helpd me understand a little better how alcohol content is measured in a liquid. There is Specific Gravity (SG) which is the measurement of the density of a liquid at a given temperature as compared to the density of water at that same temperature.
This is measured with a hydrometer. There is also the Plato or Balling scale which is a derivative measurement based on the correllation between specific gravity and the weight of sucrose by volume. This website explains the relationship between the two measurement systems and the various ways of converting between them.
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