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Ethanol, drinking alcohol, disappears in the mouth, the stomach and the small intestine and enters the blood.
Graph of blood alcohol concentration over time as a 155 lb. male consumes 4 341 ml. beers with a full stomach. Food has slowed this absorption down. Without food the absorption would be quicker.
Notice the time 1900 to 2200. At first there is absorption of alcohol through the mouth, stomach, and intestines and into the blood. Almost immediately elimination begins as the liver starts to metabolize the alcohol. The blood alcohol concentration rises during this absorptrion phase because absorption greatly exceeds elimination.
After that there is a plateau where the BAC stays fairly constant or bounces up and down a bit. Plateau absorption rate equals elimination rate approximately but stomach flap sometimes opens to let contents into intestine. Some people may plateau for 2 hours.
The elimination phase starts about 2300. elimination would have continued through 0100 and beyond at a rate of about 10 to 20 mg/100mls per hour. Back calculations work ONLY in the elimination phase, if at all.
Don't use this information to calculate your own BAC, that could be dangerous. The BAC equivalent of each bottle of beer varies from individual to individual and varies with weight, gender, and body shape.
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See also: elimination
See also: absorption
See also: employee education
See also: As Soon as Practicable
See also: acetone
See also: acetone
See also: last drink defence
See also: bolus drinking
See also: rising alcohol
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