Density and Boiling Point?

  1. 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?
  2. jcsd
  3. 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.
  4. 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.
  5. mathman

    mathman 6,754
    Science Advisor
    Gold Member

    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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