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Density and Boiling Point?

by SuperSandwich
Tags: boiling, density, point
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Apr20-14, 07:02 PM
P: 2
Just a random question. Is there a specific relationship between density and boiling point? If there is, what is it and why do they relate?
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Apr22-14, 01:53 PM
P: 558
In general I don't think there is. I believe that molecules that have similar type of chemical bonds (e.g. covalent bonds) in general will have higher boiling points as the density of the pure substance increases.
Apr22-14, 05:29 PM
P: 1,948
There are two things that play a major role in the boiling point of substances

1: how heavy are the molecules.
2: how strong are the attractive forces between molecules.

Apr22-14, 06:45 PM
Sci Advisor
P: 6,039
Density and Boiling Point?

One additional factor is outside (atmospheric) pressure.

From Wikipedia, the free encyclopedia

Boiling water
The boiling point of a substance is the temperature at which the vapor pressure of the liquid equals the pressure surrounding the liquid[1][2] and the liquid changes into a vapor.

A liquid in a vacuum has a lower boiling point than when that liquid is at atmospheric pressure. A liquid at high-pressure has a higher boiling point than when that liquid is at atmospheric pressure. In other words, the boiling point of a liquid varies depending upon the surrounding environmental pressure. For a given pressure, different liquids boil at different temperatures.

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