MadSci Network: Chemistry
Query:

Re: Is the boiling point for thick liquids different than for water?

Date: Tue Mar 10 21:00:21 1998
Posted By: Samuel Conway, Senior Scientist, Message Pharmaceuticals, Aston, PA
Area of science: Chemistry
ID: 887661070.Ch
Message:

In general, yes.  "Thick" liquids -- what we call "viscous" fluids, like
syrup and oil -- do tend to have higher boiling points.  That is because
they are usually very very large molecules which are harder to vaporize
than water, which is a little molecule.  

Now, there are other forces at work, too, so it is not accurate to say
that thick liquids boil higher than thin ones.  Also, remember that as
you heat up a "thick" liquid, it will become thinner.  Just about every-
thing is "thin" at its boiling point.  

As for boiling points, you just aren't looking in the right place.  The
best thing to do is to go to a good library and look for the CRC HANDBOOK
OF CHEMISTRY AND PHYSICS.  It will list boiling points for hundreds of
compounds other than water.

Here's an example from my own CRC:

Ether   (very thin)   BP: 34.6 degrees C.

Water                 BP: 100 

Ethylene glycol   (kind of thick)   BP: 198

Triethanolamine   (really thick!)   BP: way high (277 under vacuum)




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