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Pages: 21

Ele and the induced dipole due the field that thatp

Surface Energy Density and Surface Tension

L f

Thus it is clear that the surface of the

liquid must have a higher energy than

Sometimes the unit is given equivalently Thus γ = f / L

as Nm-1, particularly when quoted as
a surface tension. The surface energy density is: (f dx) / (L dx) = f/L = γ ,  i.e.


We can use a virtual work argument
to show this for a force f acting on
an area dA and moving through a
distance dx:

L f

Langmuir-Blodgett trough


Surface Energy