Core guardrail for reproducible proof calculations.
Paraphrase preserves the source's meaning without reproducing its wording.
The text defines the wine gallon and proof gallon at 60°F and explains that alcohol blending depends on density differences between water and ethanol; calculations are only meaningful when units and temperature bases are explicit.
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Gauging and proofing: units of measurement
PDF6 extracted text supports declared units/reference-condition principle. Original PDF image unavailable; prior complete-PDF verification assertion cannot currently be reproduced. Wine gallon is a volume unit, not inherently pure-water mass or SG. Retain principle, not blanket endorsement of author's conversions.
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