@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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@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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