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Answer A Question

How long does hot water take to freeze?

Asked by anonymous - 6 years 6 months ago

This question can also be asked as:

How long would it scientifically take for hot water to freeze?

Suggested by anonymous - 5 years 9 months ago

why does hot H2O take longer than cold?

Suggested by anonymous - 5 years 8 months ago

how long does it take for boiling water to cool to 72 degrees ferinheit?

Suggested by anonymous - 5 years 5 months ago

how long would it scientifically tale for hot water to freeze?

Suggested by anonymous - 2 years 6 months ago
 

Highest Rated Answer

Answered by Milander
6 years 2 months ago
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I started with three identical glass containers, each holding 100ml (about 3.5 fl. oz.) of filtered water: one at room temperature (72?F/22?C), one at the same temperature as my hot water tap (115?F/46?C), and one boiling (212?F/100?C). I put all these into my freezer, which has an air temperature of 0?F (?18?C). Since I knew that the water would not turn from liquid to ice all at once, my arbitrary standard for frozenness was the time at which a wooden chopstick dropped into the center of the container would no longer touch the bottom. I checked each of the containers every 5 minutes. The results? The room-temperature water froze in 50 minutes. The hot water froze in 80 minutes. And the boiling water froze in 95 minutes. My verdict: no contest?not even remotely close. Given the conditions in my freezer and the water I used, I could not reproduce the Mpemba effect.

I also tried a container of previously boiled water, now at room temperature. It froze in 60 minutes?more time (not less) than the unboiled water had taken, but not by much.

http://itotd.com/articles/521/water-freezing-and-boiling-myths/

Related to this is the question of whether hot water freezes faster than cold water.......

All things being equal, cold water freezes faster.

It takes time for the energy contained in a hot object to be transferred to a cold object. However, the rate of heat transfer is proportional to the temperature difference between the two objects, so hot water will lose heat faster than cold water. In other words, if you have water at 90 degrees C and water at 10 degrees C and the freezer is at -10 degrees C, the hot water will lose heat five times faster than the cold water; however, the cold water will still win the race. As the hot water cools it's rate of heat transfer will decrease, so it will never catch up to the cold water.

Some people claim that hot water freezes faster because a pot of boiling water can be thrown into the air on a cold winter day, and it freezes in mid air creating a shower of ice crystals. Whereas a pot of cold water thrown into the air comes down as large blobs of water. This happens because the hot water is so close to being steam, that the act of throwing it into the air causes it to break up into tiny droplets. (hot water is less viscous than cold water, listen to the sound it makes when you pour it in the sink) The small water droplets have a large surface area which allows for a great deal of evaporation, this removes heat quickly. And finally, the cooled droplets are so small, that they can be easily frozen by the winter air. All of this happens before the water hits the ground. Cold water is thicker and stickier, it doesn't break up into such small pieces when thrown into the air, so it comes down in large blobs. '

Answered by: Joe Larsen, Ph.D. Chemistry, Rockwell Science Center, Los Angeles, CA

source http://www.physlink.com/education/AskExperts/ae7.cfm


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Other Answers

Answered by anonymous
6 years 4 months ago
Rated as OPINION  |  Add Comment  |  Report This

4 days and 23 hours

Comments

anonymous
commented 5 years 3 months ago

lol this people are crazyy!!!!!!!!

anonymous
commented 5 years 9 months ago

i dont think thats true

anonymous
commented 6 years ago

No way! It does not take that long to freeze water everyone knows that.

anonymous
commented 5 years 9 months ago

There us no way that it takes more than about 5 hours ( if even that long) for even HOT water to freez

Answered by anonymous
6 years 4 months ago
Rated as OPINION  |  Add Comment  |  Report This

bout 3-4 hours

Comments

anonymous
commented 5 years 9 months ago

Thats is about how long it takes for water to freeze

Answered by anonymous
6 years 2 months ago
Rated as OPINION  |  Add Comment  |  Report This

it takes 4 hours for it to freeze solid

Comments

anonymous
commented 5 years 9 months ago

that sounds about right

Answered by anonymous
6 years ago
Rated as OPINION  |  Add Comment  |  Report This

if you want it to be flimsy freeze for 1 hour not quite as flimsy 2 hours an imprint od the cup thats half solid 3 hour an imprint of the cup that is completly frozen 4 hours
-JMM

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