No. It`s more like 60 proof. There´s a comprehensive entry in Wikipedia under "alcohol proof."
Can we say if an alcoholic beverage contains 30 percent of alcohol that it's "30 proof"?
No. It`s more like 60 proof. There´s a comprehensive entry in Wikipedia under "alcohol proof."
So you're all set now?
Basically, double the percent of alcohol to get the proof.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.