In physics, Surface tension is the tension of the surface film of a liquid caused by the attraction of the particles in the surface layer by the bulk of the liquid, which tends to minimize surface area. Given below in a table is the surface tension of various liquids: Liquid. Surface Tension (N/m) Hydrogen. 2.4. Helium. 0.16. Water.
SURFACE tension is the property of any liquid by virtue of which tries to minimize it's free surface area
Surface tension of liquid is measured as the force acting per length on an imaginary line drawn tagentically on the free surface of the liquid.
Surface tension S= Force/ Length= F/1= work done / change in area
It's SI unit is Nm-1 or Jm-2
It's dimensional formula is (MT-2)
IT is a scaler quantity
Adhesive force are force of attraction between the molecules of different substances e.g the force of attracts acting between molecules of paper and ink, water,& glass etc.
Cohesive force are area of attraction acting between the molecules of same substan
e.g the force of attraction acting between molecule of water and glass etc.
Cohesive force & adhesive force are van der waals forces