How is blood alcohol concentration measured?

Answer:
Blood Alcohol Content (BAC) is measured by dividing grams of alcohol by 100 milliliters of blood. This number is then turned into a percentage. For example, in most states (like NY), the legal driving limit is .08%. Therefore, there are 8 grams of alcohol in the blood.
To see the effect of alcohol on your body, you can use on-line BAC calculators: According to BloodAlcoholContent org, this is what typically occurs at each BAC level:

.01-.06

- Feeling of Relaxation
- Sense of Well-Being
- Thought, Judgment and Coordination are Impaired

.06-.10

- Loss of Inhibitions
- Extroversion
- Reflexes, Depth Perception, Peripheral Vision & Reasoning are Impaired

.11-.20

- Emotional Swings
- Sense of Sadness or Anger
- Reaction Time & Speech are Impaired

.21-.29

- Stupor
- Blackouts
- Motor Skills are Impaired

.30-.39

- Severe Depression
- Unconsciousness
- Breathing & Heart Rate are Impaired

>.40

- Breathing & Heart Rate are Impaired
- Potential Death
First answer by CBears. Last edit by CBears. Contributor trust: 0 [recommend contributor recommended]. Question popularity: 1 [recommend question].