Answer: strong cohesive forces
Explanation:
Surface tension is the net downward force acting on the surface of liquids due to the cohesive nature of liquids.
The force of attraction between similar molecules are called as cohesive forces and forces among different molecules are called as adhesive forces.
For example: Water molecules are bonded by strong hydrogen bonding between the hydrogen atom and the electronegative oxygen atom. Thus water molecules present on the surface are strongly attracted by the molecules present below the surface and thus act as a stretched membrane.
The surface acquires a minimum surface are and thus acquire a spherical shape.
Thus the liquids with a high surface tension exhibits strong cohesive forces.
