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> 【求教】instabt hot ice
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發表於: Apr 12 2010, 15:03  評價+1
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http://www.facebook.com/video/video.php?v=...59620649&ref=nf

剛在網上看了這段片

想問問原理是甚麼呢?


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十年生死兩茫茫,不思量,自難忘。千里孤墳,無處話淒涼。縱使相逢應不識,塵滿面,鬢如霜。  
夜來幽夢忽還鄉,小軒窗,正梳妝。相顧無言,惟有淚千行。料得年年腸斷處,明月夜,短松岡。

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徐元直
發表於: Apr 12 2010, 16:24  評價+1
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過飽和溶液的結晶。


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傻俠
發表於: Apr 12 2010, 16:43  
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那為甚麼會手指掂才開始結晶??


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十年生死兩茫茫,不思量,自難忘。千里孤墳,無處話淒涼。縱使相逢應不識,塵滿面,鬢如霜。  
夜來幽夢忽還鄉,小軒窗,正梳妝。相顧無言,惟有淚千行。料得年年腸斷處,明月夜,短松岡。

蘇軾∼《江城子》乙卯正月二十日夜記夢
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徐元直
發表於: Apr 12 2010, 17:29  
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視頻上沒有說明嗎?手指上應該沾了醋酸鈉晶體作為晶種。


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香港長弓
發表於: Apr 24 2010, 03:03  
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QUOTE
Sodium acetate is also used in consumer heating pads or hand warmers and is also used in hot ice. Sodium acetate trihydrate crystals melt at 58 °C, dissolving in their water of crystallization. When they are heated to around 100 °C, and subsequently allowed to cool, the aqueous solution becomes supersaturated. This solution is capable of supercooling to room temperature without forming crystals. By clicking on a metal disc in the heating pad, a nucleation center is formed which causes the solution to crystallize into solid sodium acetate trihydrate again. The bond-forming process of crystallization is exothermic, hence heat is emitted.
QUOTE
那為甚麼會手指掂才開始結晶??


By clicking on a metal disc in the heating pad, a nucleation center is formed which causes the solution to crystallize into solid sodium acetate trihydrate again.


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