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Why does hot water freeze faster than cold water explain?
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.
Can hot water freeze faster than cold water?
Hot water freezes faster than cold, known as the Mpemba effect. The Mpemba effect occurs when two bodies of water with different temperatures are exposed to the same subzero surroundings and the hotter water freezes first.
What phenomenon can hot water freeze faster than cold water?
The Mpemba effect
The Mpemba effect is the name given to the observation that a liquid (typically water) which is initially hot can freeze faster than the same liquid which begins cold, under otherwise similar conditions.
Does warm water freeze faster ice cubes?
This process is akin to cooling off. Essentially, hot water already closely resembles cool water on a molecular level. The energy in hot water is wound up so tightly that when it is released, it cools and freezes faster than cold water.
Does hot water freeze faster than cold Reddit?
Out of the box, hot water does not freeze faster than cold water: The cold water froze about 10 or 15 minutes faster than the hot water, and there was no detectable difference between the boiled water and the other kind.
At what temperature does hot water freeze instantly?
The air is not quite cold enough to freeze water immediately, which happens at about minus-42 degrees, Terry said.
Why does hot water make better ice?
The Mpemba effect is the observation that warm water freezes more quickly than cold water. Hence the faster freezing. Another is that warm water evaporates rapidly and since this is an endothermic process, it cools the water making it freeze more quickly.
Why does boiling water freeze faster Reddit?
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.
Does soft water freeze faster than hard water?
Heating water causes the bicarbonates to precipitate out. This forms the deposits in hot water kettles, for example. Thus, preheating water (or Mpemba’s ice cream mix) softens the water, allowing it to freeze faster and at a higher temperature than cold, hard water.