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  1. Naked Science Forum
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  3. Chemistry
  4. Are there any 2 substance on Earth which have the same boiling point?
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Are there any 2 substance on Earth which have the same boiling point?

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Offline The Scientist (OP)

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Are there any 2 substance on Earth which have the same boiling point?
« on: 20/02/2011 03:05:11 »
What do you think? Thanks!
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Offline Bored chemist

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Are there any 2 substance on Earth which have the same boiling point?
« Reply #1 on: 20/02/2011 15:24:35 »
Yes.
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Offline Don_1

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Are there any 2 substance on Earth which have the same boiling point?
« Reply #2 on: 23/02/2011 11:59:00 »
Fair enuffski. Clear, concise and right to the point.
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Offline Bored chemist

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Are there any 2 substance on Earth which have the same boiling point?
« Reply #3 on: 24/02/2011 07:15:40 »
I wondered why anyone asked the question.
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Offline The Scientist (OP)

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Are there any 2 substance on Earth which have the same boiling point?
« Reply #4 on: 24/02/2011 13:38:05 »
What makes you think so Bored Chemist? Care to share? thanks!
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Offline lightarrow

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Are there any 2 substance on Earth which have the same boiling point?
« Reply #5 on: 24/02/2011 14:59:56 »
Quote from: The Scientist on 20/02/2011 03:05:11
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.
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Offline Geezer

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Are there any 2 substance on Earth which have the same boiling point?
« Reply #6 on: 24/02/2011 19:06:03 »
Quote from: lightarrow on 24/02/2011 14:59:56
Quote from: The Scientist on 20/02/2011 03:05:11
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]
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Offline Bored chemist

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Are there any 2 substance on Earth which have the same boiling point?
« Reply #7 on: 24/02/2011 19:24:09 »
Quote from: The Scientist on 24/02/2011 13:38:05
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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Are there any 2 substance on Earth which have the same boiling point?
« Reply #8 on: 25/02/2011 11:43:36 »
Quote from: Bored chemist on 24/02/2011 19:24:09
http://www.mcallister.com/graphics/vapor4.jpg
What do ΣS or ΣP4  mean?
                       S       
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Offline imatfaal

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Are there any 2 substance on Earth which have the same boiling point?
« Reply #9 on: 25/02/2011 11:49:14 »
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
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Offline lightarrow

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Are there any 2 substance on Earth which have the same boiling point?
« Reply #10 on: 25/02/2011 15:05:48 »
Quote from: imatfaal on 25/02/2011 11:49:14
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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Are there any 2 substance on Earth which have the same boiling point?
« Reply #11 on: 25/02/2011 16:45:47 »
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?
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Are there any 2 substance on Earth which have the same boiling point?
« Reply #12 on: 25/02/2011 21:06:55 »
Quote from: imatfaal on 25/02/2011 16:45:47
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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Are there any 2 substance on Earth which have the same boiling point?
« Reply #13 on: 07/04/2011 05:37:07 »
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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Are there any 2 substance on Earth which have the same boiling point?
« Reply #14 on: 07/04/2011 07:33:15 »
or, you can simply change the boiling point of any substance by altering its pressure. Pressure cookers are quite good at doing that.
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