| Topic: |
Science > Physics |
| User: |
"" |
| Date: |
25 Sep 2006 07:40:38 AM |
| Object: |
A problem on surface tension |
We know that on the surface of a free liquid in a container the force
of surface tension acts, as the molecules of the upper surface film
experience a force of attraction by the lower molecules in downward
direction. Does this mean that the upper surface film's molecules move
downward, or is there some other force which prevents them from doing
so???
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| User: "Andy Resnick" |
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| Title: Re: A problem on surface tension |
25 Sep 2006 08:17:21 AM |
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wrote:
We know that on the surface of a free liquid in a container the force
of surface tension acts, as the molecules of the upper surface film
experience a force of attraction by the lower molecules in downward
direction. Does this mean that the upper surface film's molecules move
downward, or is there some other force which prevents them from doing
so???
I have to admit a bias against this model for interfacial energy, simply
because the thermodynamic explanation is sufficient, and the detailed
molecular description adds too much complexity without adding any real
additional understanding.
The interfacial energy arises from the existence of a dividing surface
between two different immiscible phases. We assume that the dividing
surface is infintesimally thin, and then the shape of the dividing
surface is given by balancing the pressure jump to the surface curvature
(Laplace equation). It does not require the existence of a force,
although Young's equation is derived by equating forces at a three-phase
line.
--
Andrew Resnick, Ph.D.
Department of Physiology and Biophysics
Case Western Reserve University
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