English vs metric. British vs American. Sheesh. I was watching a documentary on Scotch whisky and they said there's 16 drams in an ounce. Well, that got my attention because I've long known there are 8 drams to an ounce - if your shot is an ounce worth then that's 8 drams. And this was a documentary on SCOTCH. How could they get that wrong?
Well, I looked it up and they DID get it wrong but they also got it right. It turns out there are several drams. As if life weren't complicated enough. In the avoirdupois system of WEIGHT, a dram weighs one sixteenth of an ounce. Not terribly useful to use when speaking of liquids and my guess is their research person didn't research closely enough.
In the apothecarie's system (also weight based) a dram is an eighth of an ounce. However, if we look at liquid measures, then in the US a dram is 1/8 of a fluid ounce. Finally, the definition I've been familiar with. And in the British lands, a dram is apparently a volume equal to 0.217 cubic inches. Give me a break! Pulling out my trusty calculator and 25.4 mm to an inch finally let me determine that they're agreeing with the Americans: 8 drams per liquid ounce. Exactly as shown below, next to a spice jar for reference.
So there you have it. Cheers!