Abstract
The rate of loss of total surface area of a foam contained in a fixed volume at constant temperature may be determined from the measured rate of increase of gas pressure in the head space above the foam. The rate of loss of surface area of foams with different drainage characteristics is reported and compared with computed results based on a model proposed by Lemlich. Lemlich's model can be adapted to compute the decline of total surface area of a foam with time due solely to interbubble gas diffusion. Reasonable agreements between computed and observed data are obtained even when a constant thickness of foam lamellae is assumed; better agreements are obtained if the effects of capillary drainage of interstitial liquid are taken into account.
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