Blood alcohol concentration is defined as the number of what substance in every 100 milliliters of blood?

Blood alcohol concentration (BAC) is defined as the amount of alcohol present in a given volume of blood, specifically measured in grams per 100 milliliters. This measurement allows law enforcement and medical professionals to assess the degree of intoxication of an individual and to make determinations regarding safe driving limits, legal standards, and health effects of alcohol consumption. The use of grams as the unit of measure is standard in both scientific and legal contexts, ensuring consistency in enforcement and public safety regulations related to alcohol consumption. Understanding BAC is crucial for interpreting standard field sobriety tests and determining the impairment level of a driver.