Ah yes, the tragic corollary to those times when you need to empty a keg and it just. Won't. Die.
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They produce the same number, 1 ppm = 1 mg/L, but people prefer to say parts per million.
I would say it seems logical that molecular weight is equal to the sum of the atomic weight of the atoms in the molecule...
I'm not a microbiologist, but, do yeast produce a significant amount of CO2 during aerobic metabolism?
I'm not in agreement with Denny on the starter gravity. In talking with Chris White (White Labs) many years ago, he said they culture their yeast using a much lower gravity wort. He indicated about 1.020, but I see that in his new yeast book, he mentions 1.030 as a prefered starter gravity. The issue of the Crabtree Effect is more pronounced when you increase the wort gravity, which diverts some yeast metabolic effort into alcohol production instead of yeast mass growth.
Martin's comment about keeping the flask headspace purged with air makes a lot of sense to me. I would think that even with foil or foam plug you would otherwise tend to have a nice blanket of CO2 on top of the liquid.