How do igloos keep you worm?

Answer 1

The secret to warmth in an igloo is the fact that snow and ice are very good insulators. Apparently what happens is that the inside layer melts, but turns to ice because of the contact with the snow next to it -- so you get good insulation both inside and out. Of course, eventually the igloo would melt, but igloos are typically temporary shelters anyhow, used only for a few days or, at most, weeks. Because the igloo is insulated, it means that the temperature outside the igloo is much colder than inside it, this is mostly to with the fact you are sheltered from the windchill in an igloo.

Answer 2

The human body turns the energy of the food we consume into thermal energy. This thermal energy is lost from our body to the outer environment by conduction, convection, and above all radiation. The escaping heat travels around the igloo by convection and heats up a portion of the air inside.

As the cold air is thicker than the warm air, the cold air settles at the bottom of the igloo, while the warm air moves up the structure. The floor of the igloo is made up of terraces. The upper layer is the place where people sleep, the middle layer is for cooking and fires, and the lower hollow floor acts like a cold sink.

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