"Also, knowing the composition of a drink (which I'm not sure the average person would know) you COULD determine the mass of the sugar in the drink.
You know the volume, you know the density of pure water is 1, and you know the mass (with the scale). You technically have everything you need to determine the mass of the additives, which admittedly aren't going to be 100% sugar, but it gives you a ballpark.
I still think he was going for rhetorical though.
#26 | Posted by blah"
Or, if you're especially clever, you could simply read the label on the side, which will state the mass of sugar, in grams.