does hot water freeze faster than cold ?

Answer 1

The answer to this question is yes and no!!! The results will depend to a great extent on the temperature range chosen Additionally, the results will be affected by any number of external factors: such things as - different definitions of what constitutes freezing, evaporation, convection, effects of boiling, supercooling and the effects of solutes.

As an example, a simple test of placing hot water and cold water into the freezer compartment of a refrigerator will doubtless result in the cold water freezing first but in an experiment conducted by Scientific American it was found that water heated to 195 degrees would freeze three to ten minutes faster than water at 140-175 degrees. Critics counter that this was most likely due to evaporation which may have resulted in as much as 16 % of water loss compared to 7% for water at 160 degrees. The smaller the amount of water, of course, the faster it will freeze.

The issue has been researched ad-nauseum and it will no doubt continue to be researched for many years to come without agreement.

If you want to mull over the issue some more, there are countless sites on the internet dealing with this issue (just type into your search line something like - 'hot water freezes faster than cold') and you can also look up something called the 'Mpemba effect'.

Happy hunting!!

Answer 2

I'd love to blantantly contradict all the people that believe hot water freezes faster than cold water (implicit assumption: All things being equal). However.....
There is one scenario that is plausible, but I have never tested it. It was that of pouring a defined quantity of water into the same sized hole in an ice rink. The rational being that the hot water would cause local melting, over a greater area, and given that the rate of heat loss to the refrigeration mechanism is proportional to the area exposed to the coolant, it seems plausible that the under THIS circmstance, maybe in fact the hot water might freeze before the cold. But it would be wrong to generalize this to , say, the freezer , where the exposed area is a constant. So sometimes people can be right for the wrong reasons (which, in my book, still doesn't make them "right", but that's a philosophical issue for another day)

Answer 3

Yes it will as the Initial heat flux of the hot water is greater then that of the cold water, this allows the hot water to not only gain but pass the cold water in freezing not by much but it does

Answer 4

If the hot water is very hot and has been heated near its boiling point then it loses some of the dissolved gases in it. Water freezes more easily when it does not have anything dissolved in it (thats why we put salt on the roads) so its possible that water heated sufficiently may freeze faster.

Answer 5

Nope! The only factor is how fast the heat transfers from the water into its surroundings. Every degree cooled takes time; when water finally reaches its freezing point, it undergoes a phase change and becomes solid. The hot water takes additional time to cool down to the temperature of its competing cold water.

Answer 6

Pure hot water and pure hot water in the same freezer. The hot water will take a bit longer to freeze.

However, it is said that hot tap-water may freeze quicker than cold tap-water, due the mineral in the cold water lowering the freezing point a bit. It is said that hot water from the tap has less minerals, thus the freezing point is closer to 32 degrees F.

Answer 7

YES! Water hot water does freeze faster then cold. Last winter I had some cold water but no hot water from my water heater because my pipes froze.

Answer 8

no, hot water cools faster than cool water, but once they reach the same temperature, then neither one is hotter or cooler than the other, so they then freeze at the same rate.. problem is, the hot one will never catch up to the cold one

Answer 9

it incredibly is real, in some particular, fastidiously controlled circumstances, warmer water freezes swifter than chillier water. it incredibly is by way of fact the escape of warmth of evaporation might reason the warmer water to lose its warmth and crystalize at present. It is going from being a liquid to good without delay. Take a cup of boiling water exterior in Antarctica, throw it interior the air, and it will hit the floor as ice. Take a 2nd cup of 40 degree F water, do the comparable, and it will nevertheless be water whilst it hits the floor.

Answer 10

No,cuz water freezes at zero degrees celsius.cold water is closer to that temperature that hot water.so,cold water freezes faster.