Igloos and heat transfer

The way an igloo stops heat transfer is not as easy as you may think. First the material you use is very important, as ice is a very poor insulator. The right material to use is bricks of compressed snow, the reason being is that these bricks have many air pockets (air is a very good insulator) and compressed snow is allot lighter than solid ice bricks.
The hole that these bricks are cut out of should then be surrounded by the built up bricks increasing the amount of space in the igloo and reducing the work needed. There is also a “cold sump” at the bottom of the igloo where the cold air is, this allows the middle and the top to stay warmer.7-wonders---Igloo-771024[1].jpg
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Other reasons the igloo is built how it is include: the door, this usually has 1 right angle, this stops high speed winds from blowing into the igloo (stopping the inhabitants warm and stops the fire in the igloo from going out. A hole is cut in the centre of the roof to allow the smoke to vent out of the igloo. If the igloo is built right it can be 20 degrees Fahrenheit inside. This may sound bad but it is better than the -50 degrees Fahrenheit outside of the igloo. test1