ABSTRACT
If a ring of radius r (and, hence, circumference 2πτ) is placed in the surface of a liquid, then the force that is necessary to remove it, F, defines the surface tension, γ, in the following fashion:
(4.1)
The unit of surface tension is, therefore, force divided by length, and the unit dyne/cm is often used. By multiplying both sides of Eq. 4.1 with a length dimension, b, it follows that the unit could also be work/area, i.e., erg/cm2, a unit that is also used frequently.
