Why does clear water turn into white ice?
If you have frozen water in molds, you have probably noticed that the ice cubes are usually white, cloudy in color.
How does clear water turn into white ice?
Water freezes unevenly. And all impurities and gases freeze last. Typically, such cubes are transparent along the top edge (here crystallization begins earlier), and the center and bottom are white and cloudy.
Despite its cloudy appearance, this ice is quite safe for consumption. Not all impurities are harmful. White color, for example, comes from calcium and magnesium, which are important trace elements for humans.
If you freeze boiled water, the cubes will be much more transparent. The effect will be much better if you boil the water twice.
Then only air bubbles will remain among the “impurities”. To get rid of them, you need to freeze them gradually.
sea ice
The ice that forms in salty sea water deserves special attention. Its freezing point is much lower than that of fresh water. Therefore, sea ice is concentrated in the Arctic and Antarctic.
On average across the “hospital” (ocean), sea ice begins to melt at a temperature of -2.3 degrees. Moreover, sea ice’s salinity is on average four times lower than sea water.
While tap water is white, sea ice tends to have a greenish or blue tint.
Негізгі бет Why does clear water turn into white ice?
Пікірлер: 3