35 ILCS 505/1.18 - "proof Gallon" Means One Gallon of 100 Proof Alcohol
"Proof gallon" means one gallon of 100 proof alcohol For example: One gallon of 200 proof alcohol is two proof gallons. For the purpose of this definition "proof" is a term used to describe the strength of an ethyl alcohol solution and is a number that is double that of the percent alcohol in the solution. For example: "100 proof" means 50 percent alcohol.
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