The method already given for the investigation of the surface-tension of a liquid, all whose dimensions are sensible, fails in the case of a liquid film such as a soap-bubble.
- A soap bubble is simply a small quantity of soap-suds spread out so as to expose a large surface to the air.
Let us measure it in the case of the spherical soap-bubble by considering the stress exerted by one hemisphere of the bubble on the other, across the circumference of a great circle.
9 represent a section through the axis Cc of a soap-bubble in the form of a Non- figure of revolution bounded by two herical circular disks AB and ab, and having sp soap- the meridian section APa.
lipid bilayer no stronger than a soap bubble.