THIN BUBBLES AT LOW-PRESSURES

An interferometric study of very thin 'soap' bubbles at low pressures has been carried out. The bubbles have been drawn, using special techn iques, at pressures < 25 Torr. The results of evaluation of the bubble film thickness as a function of time are reported. When suitable liqu ids are used the thickness of the film converges to a limiting value t ypically around 2000 angstrom. The liquid nature of the film changes i nto that of an elastic membrane.