In ,
DerbyDad03 wrote:
On Nov 30, 2:08 pm, IGot2P wrote:
Phisherman wrote:
On Thu, 29 Nov 2007 13:21:52 -0800 (PST), DerbyDad03
wrote:
On Nov 29, 3:28 pm, "Frank" wrote:

Plus, hot water freezes faster than cold water. Hard to believe?

I know what you are referring to but that is normally NOT the case. Just
set a cup of cold water and also a cup of hot water outside when it is
below freezing and you will find that the cold water will freeze first.
Heck, you can even try it in the freezer of your refrigerator.

Be careful with that one - you might inadvertently prove his point.
Part of the theory as to why the Mpemba effect occurs in some cases is
that the container of hot water will melt the layer of frost that it
sits on faster than the container of cold water, and thus have better
contact with the cold surface of the freezer, accelerating the cooling
process.

Should this occur, I would also suspect the hot water setting up a
convection current that quickly cools the hot water heavily by
evaporative cooling, and causes some of it to evaporate so that there is
less of it to freeze.

Normally, the cold water freezes first.

- Don Klipstein )