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Soap bubbles filled with helium float in the air. Which has the greater mass – the wall of a bubble or the gas enclosed within it?

Step-by-step

The soap bubble floats and therefore the combined mass of its wall and the helium inside it is equal to that of the displaced air. Since the density of helium is less than half the density of air, the mass of the helium is less than half of the mass of the displaced air. Thus, the wall of the bubble has to be heavier than the gas it encloses.

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