Question

Consider the following five drink recipes. Calculate the number of standard drinks contained in each recipe. Assume that all spirits used in the recipe are 80 proof:

Colorado bulldog:

1 ½ oz vodka

½ oz coffee liqueur

1 oz cream

Cola to fill glass

-----------------------standard drinks

Answer 1

Proof is defined as twice the alcohol contained by volume. 80 proof means the the recipe contains 40 % alcohol.

Number of standard drinks = Amount of drink in litres * ( % by volume alcohol ) * 0.789 (the density of ethanol at room temperature)

Colorado bulldog: absolut vodka (40 % by volume alcohol), coffee liqueur ( 20 % by volume alcohol), cream (24% by volume alcohol) and cola ( 3 % to 8% by volume alcohol).

colorado bulldog uses 40 ml of vodka ( 1 oz = 30 ml) , 40 ml of coffee liqueur and 30 ml of cream with cola.

1.5 oz vodka is one standard drink,

coffee liqueur: 1.5 oz coffee liqueur is 0.5 standard drinks

cream : 1 oz cream with 24 % alcohol is 0.4 standard drinks.Image source: Wikipedia NIH standard drink comparision