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02-20-2008, 04:49 PM
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"Live with Intention"
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Join Date: Mar 2007
Location: Juneau, AK
2,629 posts, read 634,048 times
Reputation: 487
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Quote:
Originally Posted by warptman
Deeper in the snow, the preferential absorption of red begins to become noticeable. Just like with water, more red light is absorbed compared to blue. Not much more, but enough that over a considerable distance, say a meter or more, photons emerging from the snow layer tend to be made up of more blue light than red light. Typical examples are poking a hole in the snow and looking down into the hole to see blue light or the blue color associated with the depths of crevasses in glaciers. In each case the blue light is the product of a relatively long travel path through the snow or ice. So the spectral selection is related to absorption, and not reflection as is sometimes thought. In simplest of terms, think of the ice or snow layer as a filter. If it is only a centimeter thick, all the light makes it through, but if it is a meter thick, mostly blue light makes it through. This is similar to how coffee often appears light colored when poured, but appears much darker when it is in a cup.
Does glacier ice last longer in drinks? Yes, a little, because the ice crystals are larger. Crystals melt from the outside and large crystals expose less surface area per unit volume of ice; therefore, ice with larger crystals melts more slowly.
I feel like User2 now....
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