Why ice cubes are cloudy on the inside???

Have you even tried to see through an ice cube? It's always a little hazy. Isn't it strange that transparent water when frozen becomes cloudy ice? And did you know chemistry is at play even here?

What's in water?

Water consists of several gases and minerals like calcium and magnesium salts that are naturally dissolved in it. You cannot see them, but they are there.
These impurities in water reduce the temperature at which water freezes. Pure water will freeze at 0C, while water that has impurities in it will freeze at a temperature that is lower than this. In fact, the more the dissolved gas and minerals there is in water, the lower its freezing point will be.

When water freezes?

When water begins to freeze, a thin layer of ice starts to form on top. This is made from pure water as pure water freezes quicker than impure water.
The pure water becomes solid while the minerals and gases are still in a solution state. The rest of the liquid freezes slowly from the outside to inside. The centre of an ice cube is what freezes last.

There are layers of increasing concentration of impurities towards its centre. This concentration of gases results in light being refracted through the piece of ice causing it to look cloudy. Sometimes, the gases dissolved in the solution release in the form of microscopic bubbles which freeze as the ice freezes. You can also see these frozen bubbles if they are formed, inside the ice cubes.