The essential oils don't change from boil to beer, just the contributions (bitterness, flavor, aroma) that they provide to the beer. Yeast of course provides a good deal of contribution to the final smell and flavor of the beer, and so do the unfermentable sugars that endure the fermentation process, so it won't be an absolute direct connection, but there will certainly be some correlation.
NineMilBill said:The yeast and unfermentables will add to the taste for sure, but you'd have to have a serious nose to detect those two additions by smell. If you're smelling yeast...idk what kind of style that could be prevalent in...but more power to you. If you're asking if your hop aroma and taste will change from boil to bottle, the answer is most definitely. Determining what your final beer will taste like based off of your initial boil will only be somewhat effective if you're repeating a recipe and previously tasted the wort. I have rarely liked an uncarbonated beer...and every batch always comes out great (of course with room for improvement)...but hops change and enhance and do amazing things with time and the right temperature.
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