Surface
Tension
Jabarri Robinson
By the end of this slide you should be
able to:
•
Explain the definition of Surface Tension.
•
Describe structure of water molecules in Surface Tension.
•
Describe Surface Tension’s importance to living things
Surface Tension Definition
•
The property of the surface
of a liquid that allows it to
resist an external force,
due to the cohesive
nature of its molecules.
Water molecules structure in Surface Tension
•
Surface tension as described
before is an attraction between
the molecules on the surface of a
liquid. Inside and away from the
surface of a liquid, all of the (blue)
molecules are pulled by
neighbouring molecules with an
equal force as shown in the
diagram, to the left. At the
surface, however, the (green)
molecules are pulled inward with
a force greater than their
attraction to molecules in the
neighbouring medium - whether it
be a gas or an immiscible liquid.
This results in the propensity for the
surface of the liquid to be smooth
and for the surface area to be
minimized. In short, the surface of
the liquid behaves like a thin film.
Examples of Surface Tension
Importance of Surface Tension
•
The phenomenon surface
tension is important because it
allows the movement of different
insects such as mosquitoes over
water. This allows them to seek
for food and shelter.
•
In plants surface tension play an
even more important role, this is
because it gives the shape of
rain droplets which are both
helpful to the plant itself when
receiving water and insects on
plants.
End Of Presentation
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