Mastering the Bar Dose
30/04/2018
Edit: the Irish coffee recipe is detailed on its dedicated site: irish-coffee.nun.tf
It’s official: "All drinks served in a bar or restaurant (beer, wine, aperitif, ...) contain the same amount of alcohol, equivalent to 10 g of alcohol."
Numerunique’s Irish coffee funnel also helps you master this "bar dose."
Given that alcohol has a density of 0.80 and whiskey is 40% alcohol, it’s easy to calculate that the 10 g of alcohol is contained in 31.25 ml.
Since the density of water at room temperature is 1.00, it’s even easier to deduce that 31 ml of water weighs 31 g.
To determine the volume of this bar dose of whiskey in a glass, simply weigh 31 g of water in it. Then measure the distance from the top of the glass to the surface of the 31 g of water to get the dimensions for an Irish coffee funnel that marks the bar dose of whiskey, as shown in the example below (with an INAO glass, ISO 3591 standard):
