<P> Blood alcohol concentration is usually expressed as a percentage of ethanol in the blood in units of mass of alcohol per volume of blood or mass of alcohol per mass of blood , depending on the country . For instance , in North America a BAC of 0.1 ( 0.1 % or one tenth of one percent ) means that there are 0.10 g of alcohol for every 100 mL of blood . </P>
blood alcohol concentration means the parts of alcohol in the blood in relation to what
ethanol