SURFACE TENSION

SURFACE TENSION
Surface tension is the force caused by an object that works on the surface of the liquid along the surface that touches it. If F = force (newtons) and L = length (m), the voltage-surface, S can be written as follows:
S = F / L

 


      The surface tension is affected by the force of cohesion between water molecules.
The dye molecules attract each other normally. On the inside of the liquid, the liquid each molecule is surrounded by other molecules on each side: but on the surface of the liquid, only molecules of the liquid on the side and underneath. At the top there is no other liquid molecules. Because the liquid molecules attract each other with each other, then there is zero net force on the molecule size is the fluid inside. Instead, the fluid molecules located on the surface of the liquid molecules drawn by its sides and bottom. As a result, the surface of the liquid contained total force trending downward. Because of the total force him down, then located on the surface of the liquid tends to minimize the surface area, to shrink as strong as possible. This causes the liquid layer on the surface as if covered by a thin elastic membrane.This phenomenon we are familiar with the term Surface Tension.

  The cohesive forces that occur between molecules cause the phenomenon of surface tension liquids. In most of the liquid, each molecule is pulled equally in all directions by the surrounding fluid molecules and produce zero net force. The molecules at the surface do not have other molecules on all sides of the area and because it was drawn into. This creates some internal pressure and forces liquid surfaces to make the contraction to the minimum.

Reference:
http://id.shvoong.com/exact-sciences/physics/2287280-penyebab-tegangan-permukaan/#ixzz2FCqJEtvq
http://id.wikipedia.org/wiki/Tegangan_permukaan