Is There a Relationship Between Density and Boiling Point?

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Discussion Overview

The discussion explores the potential relationship between density and boiling point of substances, questioning whether a specific correlation exists and the underlying reasons for any such relationship. The scope includes theoretical considerations and conceptual clarifications regarding the factors influencing boiling points.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • Some participants suggest that there may not be a specific relationship between density and boiling point.
  • One participant proposes that molecules with similar types of chemical bonds tend to have higher boiling points as density increases.
  • Another participant identifies two major factors affecting boiling point: the molecular weight of the substances and the strength of the attractive forces between molecules.
  • A further contribution highlights the role of atmospheric pressure in determining boiling points, noting that boiling points vary with changes in external pressure.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between density and boiling point, with no consensus reached on whether a specific relationship exists.

Contextual Notes

Some claims depend on assumptions about molecular structure and environmental conditions, and the discussion does not resolve the complexities of these relationships.

SuperSandwich
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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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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.
 
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.
 
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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