This has bothered me ever since I first heard the phrase as a kid.
If air is a good insulator, why do we fill things with insulating material? (Ex: walls with fiberglass, coats with cotton)
I realize these things are very porous, so hold a lot of air. But by them being used at all, must mean air isn’t that great on its own.
Is it just a matter of air is only “good” and other stuff is just even better? Or is it just considered good by being a bad conductor?
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My brother-in-law did not insulate his roof because “air is the best insulator”.
Now, when he heats his house, the hot air rises, and exits his house through the roof.
You need to keep the air where it is, that’s wat insulation does.
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