Blood alcohol concentration (bac) is a measure of aicohol in your body, expressed as grams of alcohol per 100 ml of blood. for a bac of 0.05, every 100 ml of your blood contains 0.05 grams of alcohol. your bac can be measured through your breath, blood, and urine. drivers with an open licence havce to kep under a bac of 0.05. scientists estimate the mass of blood in a human body to be approximately 8 percent of body weight. if we assume that 15% of the alcohol that a person drinks from beer goes into the bloodstream, how many glasses of beer can a 85 kg person drink to get a bac of 0.05? a standard glass of beer is 250 ml, the alcohol content of beer is 600 volume, and the blood density is ρbloo,-1025 kg, palcohol-789 m 3