Why warm water becomes ice quickly as compare to cool water??
Answers
Explanation:
there are five proposed mechanisms for what's going on here:
Frost melting: Frost is an insulator, and so frosty cold water might keep its heat better than a warm beaker that melts the frost off its sides.
Dissolved gasses: There are more dissolved gasses in cold water than warm water, and researchers have predicted that this could play a role in cooling rates, although it's not clear how.
Supercooling: We all know that water freezes at zero degrees Celsius, but sometimes it gets a lot colder before it freezes - a phenomenon known as supercooling. This occurs because ice needs a nucleation site, such as an air bubble or impurity in the water in order to form. So maybe warm water experiences less supercooling than cold water.
Evaporation: The hot water beaker loses more water molecules through evaporation, so there's less of it to freeze.
Convection: Finally, there's the idea that warm water might cool faster due to increased convection currents. These currents occur because water cools primarily from its surface and the sides of the beaker, causing cold water to sink and warm water to rise up and take its place. The currents are greater in warm beakers, and could affect cooling rates.
There's merit in all those ideas, but the problem is that experiments over the years have controlled for all these effects, and the results have been frustratingly inconsistent.
Some labs have failed to show the Mpemba effect happening at all, while others show it happening even under varying conditions.
Answer:
If the water is initially hot, cooled water at the bottom is denser than the hot water at the top, so no convection will occur and the bottom part will start freezing while the top is still warm. This effect, combined with the evaporation effect, may make hot water freeze faster than cold water in some cases.
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