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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Air is a great insulator, water suspended in air is an amazing container and conductor of heat.
Humidity is why air can transfer and hold heat.
Air as insulation only works when it’s sealed and moisture free, that’s very hard to do so closed cell foams and fiber matting out performs.
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