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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Stationary air does not transfer temperature well, but a large volume of air is also quite mobile, and moving air changes how we perceive temperature – think of how a breeze on a hot day cools you down. We fill walls/coats with things that trap the air so it’s more stationary.
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