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in Physics by (54.5k points)

When the size of a soap bubble is increased by pushing more air in it, the surface area increases. Does it mean that the average separation between the surface molecules is increased?

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By pushing more air in the bubble the work is done to bring more molecules from the liquid contained between the outer and inner surface of the bubble to these two surfaces. So the more surface area is due to the inclusion of more molecules not due to an increase in average separation between the surface molecules.

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