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Why does the triple point temperature have very similar values to the freezing point, in most substances?

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This question is ambiguous. Originally, I thought the question was why different material have similar triple point temperatures and similar freezing temperatures. After the last edit by @ChickenP, it sounds like it is a comparison between triple point and freezing point for a given material. Please specify what is your question. –  fffred May 26 '13 at 21:40
    
Why are the triple point temperature and normal freezing point very close in temperature for most substance? this means for most given substance, why are they close? –  el psy Congroo May 26 '13 at 21:58
    
@JamesNgaiChunTat do you mean the freezing point at $1\: \mathrm{atm}$ of pressure compared to the triple point temperature? If that is your question then you need to first provide the data that shows it's actually true. What does "close" mean and what materials have this property? Without clarification and data the question can't be answered. –  Brandon Enright May 27 '13 at 1:51
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