One full bottle of vodka, which is 700 ml, contains 26 units. A liter of vodka, which is 1000 ml, contains 37.5 units.
Units are used to determine exactly how much alcohol is in a glass or bottle of spirits. The units are determine by the amount of alcohol by volume. Two drinks may be the same size but one may have more units of alcohol. A single shot of liquor is 1 unit. A glass of red wine is 1.5 units of alcohol. A woman should consume no more than 3 units of alcohol a day, while a man can consume up to 4 units.