Why do ice cubes have translucent core?

Question

If it is small air bubbles trapped in the water, then why are they not evenly spread? How come only in the center?

Answer 1

When water freezes, the air that was dissolved in it is forced out. But since in ice cube trays water freezes from the outside in, the air has no chance to escape. Thus, it forms bubbles only when it absolutely has to, starting when the remaining liquid water is so concentrated that it cannot dissolve any more air. When that point is reached, bubbles start to deposit in the ice and continue to the center of the cube.

Answer 2

It's nothing to do with bubbles or air. When water freezes it expands. In an ice cube it freezes from the outside in, This causes stresses within the cube which causes tiny hairline cracks which cause the ice to no longer be transparent.

You can make completely clear ice by freezing from one side only, you run very cold water over a metal plate that is below 0C. The water freezes on the metal and then on the ice. Because it forms on the surface, there are no stresses and the ice is completely transparent. Expensive hotels make their ice this way

Answer 3

i'm not sure but heres my theory
the bubbles form in the middle because of the way the ice cube forms as with most heat exchange the surface of the water loses heat first ie the outside of the cube freezes first resulting in the air being trapped in the middle perhaps the surface tension of the water forces the air bubble either back to the center or out of the cube all together

Answer 4

It is because the structure of ais is differentiately from water. Water with structure molecule of 2 hidrogen and one oxygen produce molocule structure like triangle and in free form. That's why the bubbles can moving freely in water. But because it density is less than water, so the bubbles will moving up not down. But if we sucking out or reduce the temperature, the water molecule will sort in a tetrahidrance structure. Just check in internet how tetrahidrance structure. This happen because water molecule want to reach at the stable energy. This structure is a rigid structure which if the bubbles is trap in that structure, the bubbles will not moving freely just like in water.