BrAC is expressed as grams of alcohol per how many liters of breath?

BrAC, or Breath Alcohol Concentration, is a measure used to quantify the amount of alcohol in a person's breath. It is expressed in terms of grams of alcohol per a specific volume of breath. The correct volume for this measurement is 210 liters.

This specific ratio of 210 liters is derived from the physiological relationship between blood alcohol concentration and breath alcohol concentration, where the average ratio reflects how alcohol vaporizes in the lungs. The use of 210 liters allows for consistency in legal standards, making it easier to correlate breath alcohol levels with blood alcohol levels, which are typically measured in grams per deciliter.

In many jurisdictions, including those governed by standards from institutions like the FDLE, understanding the correct measurement is crucial for law enforcement officers when conducting breath tests for alcohol intoxication.