Spirits are measured by alcohol content. Different scales are used in different countries. Most countries use alcohol by volume (ABV), also known as the Gay-Lussac system, which expresses alcohol content as a percentage of the total liquid volume of the beverage. A 40% ABV spirit contains 40% alcohol. In the United States, the proof scale of measurement is used, with the proof of a spirit being double the ABV. Thus a 40% ABV spirit is 80 proof. A degree symbol is customarily used when expressing proof.
As the general population begins to demand more from alcoholic beverage producers, the flavors and varieties of vodka, gin and other spirits is multiplying rapidly. Frankly, glassware won't affect the taste and flavor of every alcoholic beverage that you enjoy. Some kinds of alcohol just don't have the flavor complexity and variety of tastes of wine, scotch or beer. Still, there's nothing like enjoying a your favorite spirit in a beautifully designed crystal glass with good friends and loved ones.

