Blood alcohol content (BAC), also called blood alcohol concentration, blood ethanol concentration, or blood alcohol level is most commonly used as a metric of alcohol intoxication for legal or medical purposes.
Blood alcohol content is usually expressed as a percentage of alcohol (generally in the sense of ethanol) in the blood. For instance, a BAC of 0.10 means that 0.10% (one tenth of one percent) of a person's blood, by volume (usually, but in some countries by mass), is alcohol.
Read more about Blood Alcohol Content: Blood Alcohol Level Chart, Units of Measurement, Legal Limits, Scientific Definitions, Test Assumptions, Metabolism and Excretion, Blood Alcohol Content Calculation, Cases of High Blood Alcohol Levels
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I’d be a Dog, a Monkey or a Bear,
Or any thing, but that vain Animal,
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—John Wilmot, 2d Earl Of Rochester (1647–1680)
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—Eliza “Mother” Stewart (1816–c. 1908)
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—Friedrich Nietzsche (1844–1900)