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Q: boiling point of liquids ( Answered,   3 Comments )
Question  
Subject: boiling point of liquids
Category: Science > Physics
Asked by: jimgulden-ga
List Price: $30.00
Posted: 26 May 2003 22:43 PDT
Expires: 25 Jun 2003 22:43 PDT
Question ID: 209209
I need a liquid that boils at about 100 to 120 degrees.

Request for Question Clarification by bobbie7-ga on 26 May 2003 23:11 PDT
Do you mean 100 to 120  degrees Fahrenheit or 100 to 120  degrees Celsius?
Answer  
Subject: Re: boiling point of liquids
Answered By: angy-ga on 27 May 2003 01:23 PDT
 
Hi, Jim !

A simple definition of "boiling point" can be found in the MSDS Hyper
Glossary at:

http://www.ilpi.com/msds/ref/boilingpoint.html

It says:

"Boiling point is the temperature at which a liquid changes to a gas
(vapor) at normal atmospheric pressure.
A more specific definition of boiling point is the temperature at
which the vapor pressure of a liquid is equal to the external
pressure. The normal boiling point is the temperature at which the
liquid boils when the external pressure is one atmosphere (760 torr =
760 mm Hg = 1 atm = 101.3 kPa = 14.7 psi)."


The Alaska Science Forum explains the importance of pressure further
at:

http://www.gi.alaska.edu/ScienceForum/ASF8/876.html

"The temperature at which water boils depends on pressure. On high
mountains boiling water is too cool to make good tea, while in a
pressure cooker set for 15 pounds pressure (double normal air
pressure) the boiling point is 250 degrees F (121 degrees C). Pressure
in the ocean is due to the weight of the overlying water, and
increases by approximately one atmosphere for each 10 meters (33 feet)
depth. Deep enough in the ocean, water won't boil at all. A liquid
expands as it gets hotter and has very little volume change with
pressure, while a gas tries at the same time to expand with heat and
contract under pressure. The boiling temperature doesn't rise as fast
as the pressure, so the density of steam at the boiling point becomes
larger as the pressure increases. Eventually the compression of the
steam under the increasing pressure is so great that there is no
longer any difference between steam and water. This occurs at a
temperature of about 374 degrees C or 705 degrees F (called the
critical temperature for water) and a pressure of over 200
atmospheres, which is found at a depth of about two and a quarter
kilometers in the ocean. "



This is confirmed by the Alberta University chemistry site at:

http://www.chem.ualberta.ca/~orglabs/x61web/frames/psl3/fr_psl3_insight.html

"Boiling point
	The boiling point is the temperature at which the vapour pressure of
a liquid is equal to that of the surrounding atmosphere.
	The boiling point varies with atmospheric pressure and is corrected
to the temperature that would be observed at sea level (760 Torr).
	The higher the altitude, the lower the atmospheric pressure and the
lower the boiling point."
 


ACD provide professional software for scientists working with various
compounds. Boiling Point Pro is a program "to calculate the boiling
point for a compound, from 0.001 torr to 10 atm. Our predictions are
normally accurate to within  5C for structures with fewer than two
polar groups, and to within  10 for structures with more polar
groups. The same powerful algorithm is applied to derive the vapor
pressure as a function of temperature, so that you can determine
volatilization characteristics of your compound over a broad range of
ambient temperatures. ACD/Boiling Point Pro does not stop there
however, it will also calculate the enthalpy of vaporization at the
boiling point and predict the flash point. "  It can be found at:

http://www.acdlabs.com/products/phys_chem_lab/bp/#top


The Akre Engineering Portal has a chart showing the "Specific Gravity,
Boiling Point, and Viscosity of Various Liquids" at:

http://akre-engr.home.attbi.com/liquid-sg-viscosity.htm

This lists the boiling point NTP (Normal Temperatures and Pressures)
of some liquids in degrees Celsius.

Those that match or come close to your criteria of a boiling point
between 100-120 degrees for either Celsius or Fahrenheit are:

Celsius:

Toluene - 110.6 C

with Octane-n - 125.6 C, Ethylene bromide 131.7 C and Ethylene choride
83.9 C coming close.

Fahrenheit:


Carbon disulfide CS2   -  46.2 C   115.16 F
Methyl iodide -  42.6 C  108.68 F

with Diethyl ether - 34.7 C  94.46 F coming close.

I hope this is useful. Thank you for an interesting question.







Search terms: 
lava boiling point
boiling point liquids chart
"boiling point"
celsius fahrenheit conversion

plus: "Heat Engines", David Allan Low, Longmans Green and co. 1927
edition.
Comments  
Subject: Re: boiling point of liquids
From: craigengineer-ga on 27 May 2003 17:17 PDT
 
If you're looking for Celsius answers, angy-ga neglected to mention
one common substance that boils at 100 degrees... H20, aka water.
Subject: Re: boiling point of liquids
From: neilzero-ga on 28 May 2003 09:33 PDT
 
The boiling point of liquids is pressure depandent. At about 1/10 th
of sealevel pressure water will boil at 100 to 120 degress f. At about
110% of sea level pressure water boils at about 110 degrees c. Most
refrigents can be made to boil in that temperature range in either f
or c with the correct pressure. Licquid nitrogen will, I think, boil
at either 120K or 120R with the correct pressure if you are thinking
the Kelvin scale or the Rankine temperature scale.   Neil
Subject: Re: boiling point of liquids
From: neilzero-ga on 28 May 2003 09:46 PDT
 
Angy made one error that likely is not important to your needs. "Deep
in the ocean water won't boil at all" If the temperature is high
enough; no licqid or solid can exist, even at much higher pressure
than occurs in the deepest part of the ocean.  Neil

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