![]() ![]() The temperature of sublimation is, according to Wikipedia, -109☏. ![]() Maybe a side effect of having the cooler’s cavity nearly full of dry ice? Or the freezer ran defrost cycles for the other two?Īnyhow, to a back-of-the-envelope resolution the cooler loses a bit over 0.05 lb/hour of dry ice. ![]() I’m suspicious of that low number for the first stay, too. Which, as it happened, was about half an hour in a bike trailer during a rather hot afternoon.Ī) 7.2 to 6.7 lb -> 0.5 lb / 15 hr = 0.033 lb/hrī) 3.8 to 3.0 lb -> 0.8 lb / 11 hr = 0.072 lb/hrĬ) 2.7 lb to 2.0 lb -> 0.7 lb / 11 hr = 0.064 lb/hr Starting weight: 9.2 lb gross, so I lost quite a bit in transit. In between withdrawals, the cooler sat in the freezer and and the dry ice quietly sublimated here’s how the weight varied between uses. It used to be plenty cheaper in the old days, evidently, but everything else was, too. For what it’s worth, dry ice costs $3.50/pound under 10 pounds, then $2.75/pound over that. I started with “10 pounds” of dry ice in a half-pound Styrofoam container with 1.5-inch thick walls the total weights include the container. I used about a pound of it a time to mumble. For reasons I’m not at liberty to discuss, we had a cooler of dry ice pellets in the freezer for a few days. ![]()
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