Why does hot water freezes faster than cold water?

Question

plzzz explain it to me in simple ways, i dont get all the websites i tried..too confusing...please make it simple like dot points

thank you

Answer 1

heat is attracted to cold  so the heat will leave the hot water quicker as the heat leaves  the  cold is drawn in.  the cold will permeate the cold water a lot slower.

Answer 2

Hot water can in fact freeze faster than cold water for a wide range of experimental conditions.  This phenomenon is extremely counter- intuitive, and surprising even to most scientists, but it is in fact real.  It has been seen and studied in numerous experiments.  While this phenomenon has been known for centuries, and was described by Aristotle, Bacon, and Descartes [1-3], it was not introduced to the modern scientific community until 1969, by a Tanzanian high school student named Mpemba.  Both the early scientific history of this effect, and the story of Mpemba's rediscovery of it, are interesting in their own right -- Mpemba's story in particular provides a dramatic parable against making snap judgements about what is impossible

Answer 3

Because you have less volume of hot water than you do cold water.

1 oz of hot water will freeze before 1 gallon of cold water.

1 oz of hot water will NOT freeze faster than 1 oz of cold water, 1 gallon of hot water will NOT freeze faster than 1 gallon of cold water... etc.

It has to do with thermodynamics and heat capacity.  

Sites which claim hot water will freeze faster than cold water are full of baloney, it is junk science - they are not using the same conditions for the two tests.  If you set up the experiment WRONG, then you can get the hot water to freeze faster by doing things like:

- Have the freezer colder when freezing the hot water, and warmer when freezing the cold water.

- Some freezers have warmer/colder zones.  Put the hot water in a colder zone than the cold water.

- Drop a couple of ice cubes into the hot water.

- Put the hot water in the freezer first, then put the cold water in later.

Answer 4

this is a myth.

if you put a cup of boiling water and a cup of room-temp water into the freezer which do you think would freeze first? you have to first cool down the boiling water to room-temp then to freezing. the room-temp cup has a head start. so cooler water will always have a head start on hot water when freezing.

Answer 5

There are several theories as to why this often occurs. The simpliest explanation which covers all the theories is that the composition of hot water is different than cold water. Thus they react differently to an equal or same environment, which results in hot water often freezing more quickly than cold water.