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冬天时 温水比凉水快结冰?
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真的是酱吗?还是是骗人的![](static/image/smiley/default/sweat.gif) |
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发表于 23-5-2007 10:58 PM
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回复 #1 kaixun 的帖子
水结冰的必须条件是拥有最低的kinetic energy,而热水的kinetic energy是最高点,要一下子把最高点拉到最低点,几乎不可能(如果是纯水)
如果有可能,我想原因也离不开水的molecules的排法。
要衡量intermolecular forces,kinetic energy, 及实验室温度的重要性,唯有实验才能够证明 |
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发表于 23-5-2007 11:38 PM
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newton's law of cooling 来的
From wikipedia
A related principle, Newton's law of cooling, states that the rate of heat loss of a body is proportional to the difference in temperatures between the body and its surroundings. This form of heat loss principle, however, is not very precise; a more accurate formulation requires an analysis of heat flow based on the heat equation in a nonhomogeneous medium. This simplification can be applied so long as it is permitted by the Biot number.
http://en.wikipedia.org/wiki/Newtons_law_of_cooling
就是讲温度差异越大,温度跌的越快
![](http://upload.wikimedia.org/math/1/a/5/1a517d284fefb2293803dc32930a6e6e.png) |
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楼主 |
发表于 24-5-2007 07:12 PM
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原帖由 kensai 于 23-5-2007 11:38 PM 发表
newton's law of cooling 来的
From wikipedia
A related principle, Newton's law of cooling, states that the rate of heat loss of a body is proportional to the difference in temperatures betwe ...
是这个哦?我有看到什么Mpenba effect 的,你们有在书上看过吗? is it true? |
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发表于 24-5-2007 10:44 PM
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原帖由 kaixun 于 24-5-2007 07:12 PM 发表
是这个哦?我有看到什么Mpenba effect 的,你们有在书上看过吗? is it true?
是 mpemba effect
我以前上网读过,是一个学生发现的,但是只不过是thermodynamics 里面的theory 来的,不是什么新东西
http://en.wikipedia.org/wiki/Mpemba_effect
你发现到他的用词,'The effect is named for its rediscoverer',rediscoverer,就是讲以前已经有人发现到了 |
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![](static/image/common/ico_lz.png)
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发表于 25-5-2007 02:11 PM
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so mpenba effect is under thermodynamics?
是水里面的东西造成的吗? |
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发表于 25-5-2007 06:10 PM
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