80 proof means 40% v/v alcohol.
% v/v means 40 g solute/100 mL solution.
So if 40 g alcohol are in 100 mL, how much is in 1000 mL?
the word "proof" on alcoholic beverages is defined as twice the percentage by volume. How many ml of alcohol are in a one-liter bottle of 80-proof gin?
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