Charka: an old Russian measure of liquids used for vodka retail sales beginning from the 16th century. A charka contained a single serving of vodka -- which initially contained 150 grams (about 5 ounces) of 40 proof vodka. In the 19th century, when vodka reached strengths of 80 to 90 Proof, a smaller serving of 70 grams (about 2.25 ounces), approximately half a charka, was approved.