How much volume is there in a glass of whiskey?

A 750-ml bottle of booze (about the same size as what used to be called a "fifth" in the United States) contains 25.33 fluid ounces. That's 1.33 ounces more than three cups of booze. (A cup is 8 ounces.) But no one -- no one without a problem, that is -- drinks whiskey by the cup. More realistically, it contains about 18 jiggers of booze. (A jigger is 1.5 ounces, which is a shot and a half.)