BlackSails wrote:evilbeanfiend wrote:quintopia wrote:I didn't read the whole thread, but here's mine: A wooden bucket of water outside in freezing temperatures will freeze solid faster if it's hot than if it's cold.
i'd say this is still wrong even given the various conditions that it can happen as you seem to be suggesting that it always happens which is untrue.
The hypothesis is that hot water, due to more convection, forms a "hot top" which is more efficient for losing heat to the environment.
Ive done the experiment, and its true, for water in plastic cups in a freezer.
I would say evaporation is the vital component that has to be at least mentioned in the hypothesis--that is, the hot bucket quickly loses some liquid, so that there is less total water to be frozen. If not, then at some finite time T after the experiment starts, the hot bucket will be identical in state to the cold bucket at t=0, and the cold bucket must therefore freeze before the hot bucket.