How does a breathalyzer work?

A breathalyzer works by measuring the alcohol content in one's breath and estimating its corresponding blood alcohol concentration (BAC). When a person consumes alcohol, it is absorbed into the bloodstream through the stomach and intestine. Over time, alcohol diffuses from the bloodstream into the alveoli in the lungs. When the individual exhales, traces of alcohol are present in their breath. The breathalyzer device captures a breath sample, which is then analyzed by a chemical sensor or infrared light. The sensor detects alcohol molecules, producing an electrical signal proportional to the alcohol concentration. This signal is converted into a BAC reading and displayed on the breathalyzer's screen. The accuracy of a breathalyzer can be affected by various factors like recent intake of food or substances. Therefore, it is crucial to follow specific instructions provided with the device for precise and reliable results.