Air comes out of solution as water cools to freezing. If frozen quickly, both large and small bubbles are formed. Pure water freezes first at the periphery, trapping bubbles in the interior.

Air comes out of solution as water cools to freezing. If frozen quickly, both large and small bubbles are formed. Pure water freezes first at the periphery, trapping bubbles in the interior.

By Faith Batrack for Spring 2013 Get Wet.
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