Cloudy ice cubes result when water is frozen quickly, or ice is allowed to form on the surface of the water. When water is cooled to its freezing point, and ice starts to form, dissolved gases can no longer stay in solution and come out as microscopic bubbles. However, as ice floats in water, once there is enough ice to form a layer on the surface, the ice layer traps all bubbles within the ice cube. Ice-makers use a flowing source of water to make ice with cooling elements at the bottom, allowing the bubbles to be washed away from the top as the cube grows. An interesting characteristic of commercially made ice cubes is that they are completely clear, lacking the clouding found in the center of domestically made ice cubes.
↑ clear ice cube
↑ cloudy ice cube
↑ cloudy ice cube
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