11th Physics Online Notes -Surface Tension

Class 11 Physics

Surface tension = force / length

= F/L

= work done / change in area

Its SI unit is Nm-1 or Jm-1 and its dimensional formula is [MT-2].

It is a scalar quantity. Surface tension is a molecular phenomenon which due to cohesive force and the root cause of the force is electrical in nature. Surface tension of the liquid depends upon the nature of the liquid and independent of the surface area of the film or length of the line. Small liquid drops are spherical due to the property of surface tension.

Surface tension of a bubble

The tendency to minimize that wall tension pulls the bubbles into spherical shapes. Even though the soap film has less surface tension than pure water, which would pull itself into tiny droplets, it is nevertheless strong to be able to maintain the bubble with such a small thickness.

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