A thin film of fluid is held in a metal loop, one side of which is movable. Surf

Question

A thin film of fluid is held in a metal loop, one side of which is movable. Surface tension on both the fluid surfaces acts to reduce its surface area, so L, the length along which the surface tension is pulling, is twice the wire length. In this situation pictured, this will pull the movable wire to the left, unless some external force to the right is applied. Measurement of the force required to keep the movable wire stationary can give the surface tension, gamma . Note. It is necessary to ensure that frictional forces are very low in such an experiment. A device such as that shown in Figure 13.2 is used to mea sure the surface tension, gamma , of glycerol. The length of the moveable wire is 0.5 cm and a force of 0.63 N must be applied to this wire to maintain a constant area fluid film, what is the surface tension of glycerol?

Explanation / Answer

The surface tension is

ST=0.63 N/0.5X10-2=126 N/m

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