webolife wrote:I have another challenge for you: several years ago some science teacher colleagues and I did a "mythbusters" style experiment freezing different temperatures of water under the same conditions, in ice cube trays in a normal household freezer. The claim we addressed was the legendary claim that "hot water freezes faster than cold water."
webolife wrote:The trays were placed into the freezer at the same time. Quite to our surprise, and for reasons yet uncertain [although I'm sure you and I have some conjectures], several trials of this experiment showed that the "hot water" trays began to skin over with ice at around 3deg C,
webolife wrote: several minutes before the cold water trays begin to do this at a degree or two colder. At the conclusion, we found that the cold water trays froze completely before the hot water trays froze.
webolife wrote:Also, Pollack's work has shown that at the critical freezing point of water an infrared burst is detected.
webolife wrote:I have another challenge for you: several years ago some science teacher colleagues and I did a "mythbusters" style experiment freezing different temperatures of water under the same conditions, in ice cube trays in a normal household freezer. The claim we addressed was the legendary claim that "hot water freezes faster than cold water." The trays were placed into the freezer at the same time. Quite to our surprise, and for reasons yet uncertain [although I'm sure you and I have some conjectures], several trials of this experiment showed that the "hot water" trays began to skin over with ice at around 3deg C, several minutes before the cold water trays begin to do this at a degree or two colder. At the conclusion, we found that the cold water trays froze completely before the hot water trays froze.
Also, Pollack's work has shown that at the critical freezing point of water, an infrared burst is detected.
What do you think?
Researchers have been investigating the physical properties of water, and found that when it’s heated to between 40 and 60 degrees Celsius, it hits a 'crossover temperature', and appears to start switching between two different states of liquid.
Maol wrote:It sheds latent heat when it changes state from liquid to solid. The specific enthalpy of fusion (AKA latent heat) of water is 333.55 kJ/kg at 0 °C. It emits or absorbs that heat when it changes state, one way or the other.
And Gary, that just adds yet one more state for our "everyday" water!!
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