The Cause of the Stability of Bubbles derived from the Lung

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Abstract
Bubbles obtained from the lung and bubbles obtained from 0.1% agar solution were observed while dissolving in water not saturated with air. Their rate of contraction when lying under a glass surface is approximately 1n2 times that when lying under a layer of 1% agar jelly (in which diffusion can take place). This is interpreted as showing that the surface layer of these bubbles offers no significant resistance to the passage of gas. A theoretical treatment of a model bubble, with a resistant surface layer, dissolving in liquid, is given. The rate of contraction of bubbles obtained from the lung in air-saturated water indicates very low surface tension < 1.2 dyne/cm), and cannot be explained as due to a gas-resistant surface layer.

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