In an effort to understand variation between individual liquid membranes, we measured the mass m of 5 to 10 freshly formed liquid membranes. As a rough estimate of liquid membrane thickness, the membrane of volume V and density ρf was assumed to be a thin cylinder with a radius Rf (the ring radius). With this in mind, the film thickness τ was calculated as followsEmbedded Image

Estimated initial film thicknesses based on this equation are shown in table S2. This estimation represents an approximation of the initial film thickness here because some liquid volume may be collected near the film perimeter due to wetting of the liquid on the hydrophilic aluminum ring.

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