Why Does Hot Water Freeze Faster Than Cold Water?

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[gordthor]

That theory is all find and dandy until the hot water reaches the starting temperature of the cold water, , thus rendering the hot water to be COLD water now. Meanwhile the cold water is several degrees colder and closer to freezing. Hot water (any water)with impurities will freeze faster.

[DarthXenu]

Water freezes at 0 degrees Celsius.
That's all you need to know to debunk this.

[agylub]

All these videos ignore simple thermodynamics. Heat transfer is greatest when the temperature between two bodies ( the cup of water and the freezer ) is greatest. But the hot cup of water contains more heat therefore it will take longer to cool down. If this wacky theory were true a hot car engine ( after a long drive ) would cool down faster than a cool one ( after a short drive )

[haroldwestrich]

But if the hot water is 80° and the cool water is 40° then after some time when the hot water becomes 40° then the cool water is already much cooler, and now the hot water has the same properties that the cool water did at 40° so from that point forward it should take the same amount of time to freeze. Maybe people who freeze hot water faster are using a tea kettle with layers of calcium built up and inadvertently change the chemical composition!?!?!?

[jakesanders]

Wait.. but once the hot water reaches the same temperature as the cold water, why wouldn't it's hydrogen bonds go back to normal like the cold water's? And then they'd freeze at the same time. The cold water had a head start too, so it's hydrogen bonds are tightening while the hot water is trying to catch up and.. ugh.. this didn't answer anything