What makes an alcohol analyzer able to read the amount of alcohol in your bloodstream?

What makes an alcohol analyzer able to read the amount of alcohol in your bloodstream?
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Answer :

Alcohol is not digested by the body. It travels around intact in the bloodstream and is released in various ways, including on the breath. The device called a "breathalyzer" measures how much alcohol is contained in 2,100 ml of expelled breath, which is the same as the alcohol contained in one ml of blood. With that information, it is possible to do the math to determine if the individual is intoxicated according to legal standards. The primary method of determining how much alcohol a person has had to drink is to use an alcohol breath analyzer. The most popular alcohol breath analyzer is the Breathalyzer. The ratio of alcohol content in the blood to alcohol content in the breath is called the partition ratio. A partion ratio of 2100:1 is based on a normal body temperature (37°C/98.6°F). Higher body temperatures will give higher blood alcohol content measurements. This can be significant if (for some reason) one drinks when they have a flu or other sickness - an body temperature increase of 1°C/1.8°F
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