[extropy-chat] cool (was zombie boffins)

scerir scerir at libero.it
Thu Jun 30 17:11:06 UTC 2005


Cool!
But what does it mean? 
I'm supposing it has to do with 
the Aristotle-Mpemba effect. 

"The fact that water has previously been warmed
contributes to its freezing quickly;
for so it cools sooner.  Hence many people,
when they want to cool hot water quickly,
begin by putting it in the sun. . ."
- Aristotle [in E.W.Webster, "Meteorologica I",
            Oxford U.P., Oxford, 1923, 348b-349a]

It was called, by Aristotle, 'antiperistasis'.
"The supposed increase in the intensity of a quality
as a result of being surrounded by its contrary quality,
for instance, the sudden heating of a warm body
when surrounded by cold."

Long time ago a friend told Mpemba (a Tanzanian high
school student) that when making ice cream, he put
the hot liquids in the refrigerator to make them freeze
_faster_.

Mpemba found that other ice cream sellers in Tanga
had the same practice.

This is the Aristotle-Mpemba effect.

Mpemba, Osborne; "Cool"; Physics Education v.4,
                 p.172-5(1969)

(More references available)






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