Is it just us or is it a little bit strange that things can be and frequently are better insulators than vacuum?
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we understand why, of course, it just feels a bit weird for some reason
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@Felthry Yeah, I can see that - vacuum has literally zero conduction and zero convection, and in a lot of ordinary circumstances, the /bulk/ of heat transfer happens through those two modes ... so insulation being better when you fill the cavity feels a bit like a car getting lighter when you fill the gas tank.

It makes sense but it's odd.

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@packbat it occurs to us now that most people don't generally think of electrical insulation when someone says insulator

vacuum is indeed the best thermal insulator you can get, as far as we know
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@Felthry ohhh ... we were like "that's weird but we believe you and we can sorta see it" but it makes so much more sense with electrical insulation

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