Supplementary Information

Students are expected the calculate the BAC expected from the alcohol consumed using the following equations:

Step 1 Calculate the mass(g) of ethanol consumed

a. Ask for the % of alcohol in the drink. It is usually given in %vol/vol =D

Volume consumed: Vodka : 2 x 50 ml= 100 ml

Sherry: 2 x 80ml = 160 ml

Rum: 2 x 40 ml = 80ml

Vol EtOH consumed= D ¸ 100 x volume consumed

Mass of EtOH = vol of EtOH x 0.8 g/ml(density of EtOH)

Step 2: Calculate the volume of the body that is water

Using

70Kg as the weight of an average adult

68% as the total body water content

1 g/ml ad the density of water

Then volume of body water = 70000 g x 68% ¸1 g/ml = 47.6 L

Since 80% of body water is Blood then

Vol of water that is blood = 47.6 x 80% = 38.08L

Step 4: Calculate BAC

BAC = Mass of EtOHg/38.08L = g/L

Convert to g/100ml and the to %BAC

STUDENTS ARE EXPECTED TO CALCULATE THE BAC FOR ALL ALCOHOLIC BEVERAGE CONSUMED AND COMPARE IT WITH BREATHALYSER VALUES