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**Natashasuw** · 06-27-2012, 08:24 PM

Scientists offer £1,000 prize for answer to the question: Why does hot water freeze faster than cold?

Ancient problem has eluded scientists and philosophers for centuries
£1,000 reward offered to member of public who can provide 'convincing explanation' of phenonemon

By Daily Mail Reporter
PUBLISHED: 04:40 GMT, 27 June 2012 | UPDATED: 04:40 GMT, 27 June 2012

It is the baffling question which has perplexed the world's greatest scientific minds and even eluded great thinkers like Aristotle.
But now scientists have become so infuriated about the mystery of why hot water freezes faster than cold, that they have put up a cash reward to find the answer.
The Royal Society of Chemistry has offered £1,000 for a member of the public to come up with a convincing explanation for the phenomenon, which has mystified humankind.

Puzzler: The phenomenon of hot water freezing more quickly than cold has been dubbed the Mpemba Effect

The scientific problem, which has become known as the Mpemba effect, has also defeated Francis Bacon and René Descartes.

More...

The problem got its modern name in 1968, when Tanzanian student Erasto Mpemba posed the question to professors visiting his school.

The problem is so ancient its answer is said to have even eluded the great Greek philosopher Aristotle

Mr Mpemba, who had been studying the problem for five years, had asked Professor Denis Osborne, of Dar es Salaam University: 'If you take two similar containers with equal volumes of water, one at 35C and the other at 100C, and put them in a refrigerator, the one that started at 100C freezes first. Why?'
The professor was unable to answer and published a paper on the problem the following year, calling it the 'Mpemba Effect'.
Brian Emsley, media relations manager at the Royal Society of Chemistry, wrote in the Guardian that the winner of the £1,000 prize will need to 'make a convincing case and employ some creative thinking'.
Many standard physical effects are said to contribute to the phenomenon, although no single one has been conclusively proved as the cause.
Theories put forward based on evaporation, convection and supercooling have all been put forward, but as yet the question still remains unanswered.
Members of the public have until July 30 to submit their entries.
They will be pitted against worldwide postgraduate scientists, who, sponsored by the Royal Society of Chemistry, will be tackling the same problem.

Read more: http://www.dailymail.co.uk/sciencete...#ixzz1z1kW4xoO

06-27-2012, 08:24 PM	#1
Natashasuw Join Date Oct 2005 Posts 525 Senior Member	Why does hot water freeze faster than cold? Scientists offer £1,000 prize for answer to the question: Why does hot water freeze faster than cold? Ancient problem has eluded scientists and philosophers for centuries £1,000 reward offered to member of public who can provide 'convincing explanation' of phenonemon By Daily Mail Reporter PUBLISHED: 04:40 GMT, 27 June 2012 \| UPDATED: 04:40 GMT, 27 June 2012 It is the baffling question which has perplexed the world's greatest scientific minds and even eluded great thinkers like Aristotle. But now scientists have become so infuriated about the mystery of why hot water freezes faster than cold, that they have put up a cash reward to find the answer. The Royal Society of Chemistry has offered £1,000 for a member of the public to come up with a convincing explanation for the phenomenon, which has mystified humankind. Puzzler: The phenomenon of hot water freezing more quickly than cold has been dubbed the Mpemba Effect The scientific problem, which has become known as the Mpemba effect, has also defeated Francis Bacon and René Descartes. More... With physics, you can get universes: There is no need for a God to cause the Big Bang, says scientist What happens if you fall into a volcano? Video shows off the fate of a human-sized bag of rubbish plunging into lava pool The problem got its modern name in 1968, when Tanzanian student Erasto Mpemba posed the question to professors visiting his school. The problem is so ancient its answer is said to have even eluded the great Greek philosopher Aristotle Mr Mpemba, who had been studying the problem for five years, had asked Professor Denis Osborne, of Dar es Salaam University: 'If you take two similar containers with equal volumes of water, one at 35C and the other at 100C, and put them in a refrigerator, the one that started at 100C freezes first. Why?' The professor was unable to answer and published a paper on the problem the following year, calling it the 'Mpemba Effect'. Brian Emsley, media relations manager at the Royal Society of Chemistry, wrote in the Guardian that the winner of the £1,000 prize will need to 'make a convincing case and employ some creative thinking'. Many standard physical effects are said to contribute to the phenomenon, although no single one has been conclusively proved as the cause. Theories put forward based on evaporation, convection and supercooling have all been put forward, but as yet the question still remains unanswered. Members of the public have until July 30 to submit their entries. They will be pitted against worldwide postgraduate scientists, who, sponsored by the Royal Society of Chemistry, will be tackling the same problem. Read more: http://www.dailymail.co.uk/sciencete...#ixzz1z1kW4xoO
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