From Wikipedia:
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Blood alcohol content (BAC) or blood alcohol concentration is the concentration of alcohol in blood. It is usually measured as mass per volume. For example, a BAC of 0.02% means 0.2 ‰ (permille) or 0.02 grams of alcohol per 100 grams of individual's blood, or 0.2 grams of alcohol per 1000 grams of blood. Blood alcohol concentration is measured in many different units and in many different fashions, but they are all relatively synonymous for each other.
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This seems inconsistent. It says BAC's measured as mass per volume, then gives the ratios as mass per mass.
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Bulgarian's blood-alcohol level astounds doctors
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Bulgarian doctors tested a man's blood-alcohol level five times before accepting it was 0.914 – nearly twice the amount considered to be life-threatening. The 67-year-old man landed in hospital on Dec. 20 after a car knocked him off his feet in the southern Bulgarian city of Plovdiv, police and doctors said Tuesday.
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