Chronology | Current Month | Current Thread | Current Date |
[Year List] [Month List (current year)] | [Date Index] [Thread Index] | [Thread Prev] [Thread Next] | [Date Prev] [Date Next] |
James McKey wrote:
I've never heard of that name. I have heard thetale about hot water freezing
faster than cold, but do not see how that'spossible for equal starting and
ending masses of water under equivalent externalconditions.
My student did an Extended Essay on the topic few
years ago in the
International Baccalaureate program.
She monitored cooling and freezing of the same
amounts of water in the same
freezer in different kinds of containers. She used a
computer based measurement
of temperature. I didn't believe in the effect
before I saw how initially
warmer water actually did froze faster that colder
water. The (initially)
colder water spend more time in a super cooled state
under 0 degrees of Celsius.
Then the temperature raised to zero and started to
drop again after all the
water had frozen. This took place repeatedly for
certain kind of containers.
Why this happened remained a mystery.
Regards,
AnttI Savinainen
Kuopio Lyseo High School/IB
Finland