Are there any 2 substance on Earth which have the same boiling point?

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Offline The Scientist

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What do you think? Thanks!
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Offline Bored chemist

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Yes.
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Offline Don_1

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Fair enuffski. Clear, concise and right to the point.
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Offline Bored chemist

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I wondered why anyone asked the question.
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Offline The Scientist

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What makes you think so Bored Chemist? Care to share? thanks!
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Offline lightarrow

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There are infinite. The reason is simple: mixing (miscible) liquids in different concentrations, you can get any value between the two liquids' boiling point. For example, if you want a liquid, different than water, which boils at 100°C, you only have to choose two miscible liquids which boiling pointa are, respectively, lower and greater than that of water, let's say n-buthilic alcohol (b.p. = 118°C) and ethilic alcohol (b.p. = 79°C) and you mix them in the appropriate percentages.

If instead you intended two pure compounds, then it depends on the precision required in the b.p. value: the greater the precision, the less compunds you can find with the same b.p. values.

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Offline Geezer

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What do you think? Thanks!

There are infinite. The reason is simple: mixing (miscible) liquids in different concentrations, you can get any value between the two liquids' boiling point. For example, if you want a liquid, different than water, which boils at 100°C, you only have to choose two miscible liquids which boiling pointa are, respectively, lower and greater than that of water, let's say n-buthilic alcohol (b.p. = 118°C) and ethilic alcohol (b.p. = 79°C) and you mix them in the appropriate percentages.

If instead you intended two pure compounds, then it depends on the precision required in the b.p. value: the greater the precision, the less compunds you can find with the same b.p. values.

You can get even more if you alter the pressure  [;D]
There ain'ta no sanity clause, and there ain'ta no centrifugal force ćther.

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Offline Bored chemist

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What makes you think so Bored Chemist? Care to share? thanks!

This sort of thing.
Here are some vapour pressure vs temperature curves
http://www.mcallister.com/graphics/vapor4.jpg
Where the curves cross the two materials boil at the same temperature (and pressure).
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Offline lightarrow

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http://www.mcallister.com/graphics/vapor4.jpg
What do ΣS or ΣP4  mean?
                       S       

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Offline imatfaal

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Guesswork - combinations (ie sums) of different isotopes or allotropes?  Although ∑Cs is far too low to be carbon.  Perhaps I should wait for BC to explain rather than guess
There’s no sense in being precise when you don’t even know what you’re talking about.  John Von Neumann

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Offline lightarrow

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Guesswork - combinations (ie sums) of different isotopes or allotropes?  Although ∑Cs is far too low to be carbon.  Perhaps I should wait for BC to explain rather than guess
Cs is caesium  [:)]

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Offline imatfaal

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Of Course it is.  Doh I was reading it as many Carbons (ie one C, many Cs).  Caesium is pretty low mp/bp isnt it?
There’s no sense in being precise when you don’t even know what you’re talking about.  John Von Neumann

At the surface, we may appear as intellects, helpful people, friendly staff or protectors of the interwebs. Deep down inside, we're all trolls. CaptainPanic @ sf.n

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Offline lightarrow

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Of Course it is.  Doh I was reading it as many Carbons (ie one C, many Cs).  Caesium is pretty low mp/bp isnt it?
Yes (although I don't usually use it to cook spaghetti  [;)])

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Offline Garfed

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Are infinite. The reason is simple: mix (mixed) in different concentrations of liquid, you can get between the two liquids' boiling point of any value...

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Offline Geezer

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or, you can simply change the boiling point of any substance by altering its pressure. Pressure cookers are quite good at doing that.
There ain'ta no sanity clause, and there ain'ta no centrifugal force ćther.