Oh yes Ma'am... I don't want to encroach on your wisdom; I certainly value your knowledge greatly! You are definitely a resident bad-ass! Though classical mechanics are at play, fluid dynamics / fluid mechanics play more specifically into this equation and are an inescapable variable when dealing with the systems and processes were discussing. Not to get all science-y and tout look what I can do Alcohol influences not only absorption / desorption rates but influences fluid mechanics in that Co2 remains longer in a higher alcohol solution. Relating to body, though not the same principal of mechanics involved, the viscosity (or body) does influence absorption / desorption as well
. If explained in beer terms:
High ABV beer (10% +/- 1% ABV) with a light body will pour at any temp in any degree of resistive system at practically the same desorption rate that a high ABV beer will pour with a full body. i.e. High ABV beers regardless of body (viscosity) typically pour with little to no head though feel carbonated when consumed.
On the other hand, low ABV beer with a medium to full body (Higher viscosity) under average beery conditions will typically pour with excessive foam when resistive influence is low. Thats why longer lines obviously help with this particular fluid composition. It is actually the alcohol that plays the biggest role in absorption / desorption rates in our particular situation
Beer draft systems. Yes; temp, composition, line length (resistive degree) all play into the equation but alcohol is the one chemical factor that influences absorption / desorption rates the most.
Now that Ive probably pissed Yoop off first thing in the morning, please accept this digital cup of coffee and this nice pint to enjoy at day's end.
Prost!
-JM