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General Engineering
Buoyancy - (helium in a sealed vessel)
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[QUOTE="RPinPA, post: 6240760, member: 651116"] You have an answer, but I'll address your specific points. Correct. The buoyant force is the weight ##mg## of the displaced air, which I'll take your word for it has mass 2.3 mg. Note that this depends only on the volume of the vessel. It doesn't matter what's inside it: vacuum, helium, air, or solid iron. The buoyancy effect can be measured by comparison to the weight measured in other media. In vacuum, you should get a value with is 2.3 mg heavier. There will always be a buoyancy effect in the sense of the weight when immersed in air appearing to be 2.3 mg less than the weight in vacuum. I think you are thinking about neutral buoyancy, where the buoyant force is equal to the weight of the object. But that won't be true here with a steel vessel. It's still a lot heavier than the displaced volume of air. Whatever the buoyant force was, adding mass will cause a net mass gain. [/QUOTE]
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Buoyancy - (helium in a sealed vessel)
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