Superfluid helium defies gravity.
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A mountain-climber friend with a mass of 80 kg ponders the idea of attaching a helium-filled balloon to himself to effectively reduce his weight by 25% when he climbs. He wonders what the approximate size of such a balloon would be. Hearing of your physics skills, he asks you. Share with him your calculations that show the volume of the balloon to be about 17 {m}^{3} (slightly more than 3 {m} in diameter for a spherical balloon). | Numerade
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