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The ice that formed in our bird bath, buckets, etc. is white, but icicles are usually clear. What is the difference?

Answer:

Water usually contains dissolved gases. As it approaches the freezing point (or the boiling point), those gases come out of solution. Once the surface of a body of water freezes, the bubbles of gas are trapped, and wind up in the ice. That makes the ice cloudy. You can see that in the ice cubes in your freezer. With the icicle, the ice is in the center, and liquid water flows over the surface. As that water freezes, the gases go into the air, so the ice remains clear. Some expensive ice makers use this idea to make crystal clear ice for your drink.
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