11 March, 2002
Sunny, High 18, Low -8
Let's Talk Science: Why do we measure snow density?
The purpose of this project is to study heat flow (heat flux) from lake ice. The magnitude of heat flow depends on the temperature gradient, snow depth, and snow density. Snow density is also needed to calculate thermal conductivity.
Imagine sleeping in the middle of the boreal forest in northern Alaska at 1 am with a dry, fluffy sleeping bag. Due to its ability to retain heat from your body, air molecules are trapped within the "stuffing" of your sleeping bag providing excellent insulation.
You'll sleep all night! However, with a wet, thin sleeping bag, there is a small amount of air molecules present. Your body will lose heat through this dense, conductive material.
Dense snow is similar to a wet sleeping bag, heat will flow quickly due to lack of air molecules. During snowfall, air molecules are trapped within the snow as snowflakes pile on top of each other. More air molecules in the snow will reduce the heat flow and supply better insulation.
World Ice Art Championship
Martin's snow and ice class went on a field trip to the Ice Park just outside of the University. Ice sculpturers from worldwide
parcticipated in this annual ice carving competition. We had the
opportunity to observe a few artists at work.
Click on this website for more information and pictures. http://www.icealaska.com
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