SI unit of surface tension is Newton per Meter or N/m.
Surface tension represents the energy required to increase the surface area of a liquid by a unit of area. It’s a measure of the cohesive forces between molecules at the surface of a liquid, creating a “skin-like” effect. This unit, expressed in force per unit length, quantifies the force acting parallel to the surface of the liquid due to these cohesive forces.
Surface tension acts like a force pulling a liquid’s molecules inwards. In the SI system, this force is measured in Newtons (N). We quantify how much force acts per unit of the surface’s length (meter). Combining these units, the SI unit of surface tension becomes Newtons per meter (N/m).