What does 0.04 mean on a breathalyzer?

The BAC measures the parts of blood, which consist of alcohol. You have heard of readings, like 0.04 and 0.08, all of these are less than 1% of your blood. For example, if you blow a BAC of 0.04, it means you have 4 parts (grams) alcohol for every 10,000 parts (grams) blood.

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