Unit of surface tension is

Concept:

Surface tension: 

• Surface tension is the property by virtue of which liquid tries to minimize its free surface area.
• In spherical shape the surface area is minimum and for this reason, the raindrops are spherical.
• Surface tension is measured as the force acting per unit length of an imaginary line drawn on the liquid surface.
  \(Surface\;tension = \frac{{Force}}{{length}}\)

• Temperature: If temperature increases then the surface tension of a liquid decreases.
• Soluble Impurities: In the case of less soluble impurities, the surface tension decreases. But, for highly soluble impurities in the liquid the surface tension increases.

Explanation:

we know that,

\(Surface\;tension = \frac{{Force}}{{length}}\)

⇒ Dyne/cm or Dyne cm^-1