posted on Dec 28, 2009, 08 pm
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, Apr 25, 2017, 05 pm
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, Aug 22, 2010, 12 pm
Duck power, activate!
, Sep 05, 2010, 07 pm
It's actually boiled water the freezes faster then cold o0o
and it's because extra gases are boiled out of the water.
, Sep 19, 2010, 04 am
I din't know about that! o.o must experiment it later!
, Sep 27, 2010, 05 pm
I really like that the boy seems so happy and at peace... until the duck talks.
, Oct 09, 2010, 12 pm
im disappoint that there are so many questions yet there are no answers.
, Oct 31, 2010, 11 am
its because theres less of it to freeze. if you place equal volumes of hot and cold water in a glass, more of the hot water will evaporate over a period of time than the cold. So when you put hot water in the ice tray, your just making smaller ice cubes. you're better off starting with cold water, but nor filling it up so high. Also helps prevent spillages, which are more uncomfortable when using boiled water.
, Jul 08, 2015, 04 pm
Water is actually an odd liquid in many ways. It condenses when cold until just above the freezing point, then starts expanding again.
Hot water freezing faster than cold is known as the Mpemba effect, after the Tanzanian student who in 1963 noticed that hot ice cream mix freezes faster than a cold one, though Aristotle actually first wrote about it. Now a team of physicists from the Nanyang Technological University in Singapore, led by Xi Zhang, have found evidence that it is the chemical bonds that hold water together that provide the effect.
They propose that when the water molecules are brought into close contact, a natural repulsion between the molecules causes the covalent bonds to stretch and store energy. When the liquid warms up, the hydrogen bonds stretch as the water gets less dense and the molecules move further apart.
The stretching in the hydrogen bonds allows the covalent bonds to relax and shrink somewhat, which causes them to give up their energy. The process of covalent bonds giving up their energy is essentially the same as cooling, and so warm water should in theory cool faster than cold. The team’s calculations suggest that the magnitude of the covalent bond relaxation accounts for the experimental differences in the time it takes for hot and cold water to freeze.
, Aug 05, 2015, 05 pm
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