Igloos keep you toasty and warm even in the worst winter conditions. But how do they do that when snow itself is naturally really cold? How does it work when, in places like Lapland, temperatures can easily drop many tens of degrees below freezing with a wind chill factor to match?

Intuition suggests an igloo shouldn't work. Why don't they melt as you sit inside, freezing you like a human icicle? Why doesn't the snow itself cool down the air inside the igloo so much that it just gets colder and colder? What about the wind? And how do you sleep on a bed of actual ice? It's fascinating.

If you're considering igloo holidays and have ever wondered how does an igloo keep you warm, here's the science bit.


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