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Blood Alcohol Concentration

Blood alcohol concentration (BAC) is the concentrated amount of alcohol within a person's bloodstream. One of three different methods is used to measure BAC: a proportion of a person's size, mass per quantity, or a combination of the two. For example, a BAC of .30% can mean 3 grams of alcohol per 1,000 grams of someone's blood, or it can mean .3 gram of alcohol per 100 milliliters (ml) of blood.

How many drinks someone has had is not the best method for gauging the level of inebriation, primarily because individuals differ in their alcohol tolerance. One drink increases a normal person's BAC by approximately .03%. However, this fluctuates due to the high level of individual differences concerning body mass, gender, and body fat percentage. Moreover, ...

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