The most common scene that we see on TV is when somebody gets pulled over then a certain cop asks, “Have you been drinking?”. Cops frequently use breathalyzers to measure the amount of alcohol in a driver’s breath because it’s considered a more accurate type of sobriety test. Alcohol is not immediately digested, it remains in the bloodstream after it has been ingested. Part of the blood passes in the lungs where traces of alcohol are released along with the expelled air and instantly detected by the breathalyzer. It consists of three things: a sampling system, a reaction chamber with two vials, and a detector.
The cop will ask the drunk driver to blow through the mouthpiece for about 10 seconds, then part of the air that the suspect blows through the sampling system. In the sampling system, the breath is bubbled in a vial through a mixture of sulfuric acid, potassium dichromate, silver nitrate, and water. Each chemical has its function: the sulfuric acid removes the alcohol from the air into a liquid solution, the reddish-orange potassium dichromate reacts with the