MadSci Network: Chemistry |
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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