Blood alcohol concentration means the parts of in blood relation to oxygen blood?

There is no such thing as "blood alcohol concentration means the parts of in blood relation to oxygen blood". Blood alcohol concentration (BAC) is the amount of alcohol in a person's blood, typically expressed as a percentage or grams of alcohol per deciliter of blood. It is used to measure the level of alcohol intoxication in a person and is often used by law enforcement to determine if someone is driving under the influence of alcohol.