Surface tension is usually referred to as a line force (i.e., units of force per unit leng...

Surface tension is usually referred to as a line force (i.e., units of force per unit length) rather than a surface force (like pressure with units of force per unit area) or a body force (like specific weight with units of force per unit volume). Examine the development of Equation and explain why the concept of a line force is a logical one.