This is what an Igloo looks like when you build a fire inside. The fire inside melts the inner layer of ice, and the cold outside refreezes it, adding a layer of insulation that can keep the igloo at 60° inside while it's -50° outside.

This is what an Igloo looks like when you build a fire inside. The fire inside melts the inner layer of ice, and the cold outside refreezes it, adding a layer of insulation that can keep the igloo at 60° inside while it's -50° outside.

on June 29, 2019

https://ift.tt/2YoEnMW via /r/pics https://ift.tt/2FFt8bs

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