"One molecule of water moving through the radiator at the speed of sound would cool less then one moving a 10mph."
But we are not talking about one molecule, we are talking about is how many molecules over a period of time, ie rate, who cares what each molecule absorbs, its the overall result that is the issue I believe, and as noted, the more molecules the higher the T delta.
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.