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Engineering
General Engineering
Buoyancy - (helium in a sealed vessel)
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[QUOTE="men5j2s, post: 6240625, member: 665841"] [B]TL;DR Summary:[/B] 1atm of air + 1atm of HE in a 17.5ml vessel = a mass gain of ~2.9mg Hi All, I'm trying to answer a question once and for all that has caused more debate than it ever should have (talking about an internal debate)... If I fill a sealed vessel (say an aluminium vessel with appox. 17.5ml of internal volume) with varying amounts of helium ( 1bar, 2bar, 3bar ... 10bar), will I see a net mass gain or loss? My current understanding is as follows: [LIST] [*]The sealed vessel is displacing a volume of air (assuming a vacuum), and therefore will have some buoyancy! (approx -2.3mg) [*]The weight of the vessel is larger, so it won't float, but the buoyancy effect can be measured! [*]Adding air to 1atm (~1bar absolute) inside the vessel, means density equilibrium inside and outside the vessel, so no buoyancy effect! [*]Adding helium to 2atm (on top of the 1atm of air) will simply add more moles to a closed system that is already overcoming any buoyancy effect, by virtue of the 1atm of air that was in there, therefore there will be a net mass gain. [*]I should end up with a weight gain of ~2.9mg [/LIST] [/QUOTE]
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Buoyancy - (helium in a sealed vessel)
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