Is it true that warm water freezes quicker than cold if so why?

Answer 1

The Mpemba Effect: When Hot Water Freezes before Cold
See the site attached

Answer 2

No, this is an abomination of an actual scientific fact. If you take water and boil it and let it cool off and then put it in the freezer, it will freeze faster than water that had not been boiled. The dissolved gases in the water will be released when it was boiled and that will help the water freeze faster. That will change the specific heat. However, in this example, both sets of water enter the freezer at the same temperature.

Now, if you just heat some water and put it in the freeze with water at room temperature, then the water at room temperature will freeze faster. The the water will start to lose thermal energy to the air in the freezer. This will make the water start to cool off. The warm water will cool down and at some point it will be the same temperature as the room temp water. At this time, the room temp water will have already cooled off. The warm water has now reached the starting point of the room remp water. The room temp water has had a head start.

This is a little like two cars racing towards a finish line and both the cars can only go the same speed and but one starts further away. The closer car will always win.

Answer 3

Apparently there is an observed effect where under some conditions a slightly warmer container of water will freeze before a cooler one, but the effect is not well understood. But do not think that 90 degree water freezes sooner than 40 degree water; it has to be a much smaller temperature difference than that.

This question has been asked before and like most people I fell into the obvious trap of assuming that it took some time for the warmer water to cool to the same temperature as the cooler water while the cooler water had time to cool even more, but it isn't so simple. One of the other answers pointed to some good links about it, but I don't recall the details just now.

Answer 4

I recant my previous answer:
I've been wrong before, I wasn't considering metastability.

No, the initial rate of cooling is higher, but it takes longer to freeze.

The cooling rate depends on the difference in temperature between the water in this case and its ambient surroundings. The greater the difference the faster the cooling. The naive view is that this initial rate stays the same, thus the surprisingly pervasive view that warm water freezes quicker. But think about it; the warm water has to pass through the temperature of relatively cooler water on the way down to freezing, right? The water doesn't remember what temperature it came from, right?

Answer 5

No

The effect that someone else mentions shows that in certain cases warm water will freeze faster than slightly less warm water. It is very easy to find out on your own. Fill an ice tray with cold water and another with warm water and put them in your freezer. Check on them about once every half hour or so. I promise that the one that was filled with cold water will freeze first.

Answer 6

The rate at which warm water cools is faster, due to the larger gap between the temperatures. But when it gets to the temperature of the cold water it cools at that rate. By then the cold water is probably frozen. Don't put warm water in your ice cube trays, that will use more electricity in your freezer, and probably melt other foods.

Answer 7

"There are countless issues that help the nice and snug pail freeze swifter than the chilly pail. listed right here are what's known to be the biggest factors: the nice and snug water is greater probably to be supercooled. this means that the nice and snug water's temperature is greater probably to kick back to temperatures below 0 stages Celsius. interior the chilly non-supercooled water, ice crystals type and drift to the best, forming a sheet of ice over the best of the water, bobbing up an insulating layer between the cooler air and the water. This ice sheet additionally stops evaporation. interior the nice and snug water that has replace into supercooled (for this reason, now no longer warm) the water, whilst it does freeze, freezes in the process, bobbing up greater or much less of a slush earlier freezing stable. Why is warm water greater probably to be supercooled? with the aid of fact warm water is way less probably to contain tiny gasoline bubbles. gasoline bubbles type from dissolved gasses with the aid of fact the water cools. whilst the nice and snug water became heated, those dissolved gasses would have been pushed out. In chilly water, ice crystals use the tiny bubbles as commencing factors for formation (in physics, we call them nucleation factors). yet interior the nice and snug water, there are no bubbles, so there are not as many commencing factors for the ice crystals." Google your question and additionally you would be supplied with a great number of solutions.

Answer 8

Yes it is true.
Put one ice-cube tray of warm water and one of cold in your freezer. See the amount of evaporation that comes off the warm one?
Because it's evaporating faster then the cold one there is actually slightly less water in the tray at freezing temp then the cold so the warm one will freeze faster then the cold one.

Answer 9

Its definitely true that if you put a bowl of warm (not boiling) water in the fridge it freezes ahead of a room temperature water beside it. Im afraid I can't explain the science behind it, but rest assured it is a true fact.

Answer 10

Listen here-

No matter what anyone says, WARM WATER FREEZES QUICKER THAN COOL WATER.

Remember that. Strange but TRUE.

Sorry, don't know why...