this post was submitted on 05 Oct 2024
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Weird News - Things that make you go 'hmmm'
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Crimping and folding it around the edge of the pan or the foil itself. Foil can hold in the steam of a pan in the oven or a foil pack on a campfire, for practical purposes that's air tight. If you're trying to contain superheated helium then it's a different story.
Not air tight enough for extended storage purposes, too air tight for cooling in the fridge. It's all relative as your examples demonstrate.
Hm. I now wonder if it depends. But I don't wonder enough to do an experiment, lol