/sci/ - Science & Math

Fellas, I'm wicked perplexed.

I just made myself a glass of RumUp, or 7Rum. Whatever you prefer. I'm not a Nazi about it. But it's a mixture of rum and 7up and it's awfully heavy on the rum. However, I'm noticing a distinct separation of liquids in the glass. about 2/5 of the way up the glass from the bottom there is this line where I can see a separation of the solution.

What gives? Isn't rum just sugary ethyl alcohol, which is completely soluble in water? Or is it only soluble in certain concentrations. Bully me if you will for being a daytime alcoholic ( I work graveyard shift at a menial minimum-wage job six days a week so I feel almost perfectly justified drinking at 9:50 AM PST ), but don't bully me too much about being ignorant in such topics as the one I'm asking about. I failed out of the first semester of high school chemistry because I was busy getting high and driving girls who would never fuck me around in my used V6 car (which was apparently impressive at the time for a 17 year old).

Enlighten me, if you deign it worth doing so, kind /sci/ciopaths.

>pic mostly unrelated