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**WhileKelf** · 09-11-2012, 02:59 AM

Sure, but gravity can not be both the fuel on the way up and on the way down.

On the ascent it does, until the buoyancy of the balloon matches the slowing potential energy as it rises (and hitting it's maximum atmospheric pressure expansion capabilities)

09-11-2012, 02:59 AM	#38
WhileKelf Join Date Oct 2005 Posts 429 Senior Member	Sure, but gravity can not be both the fuel on the way up and on the way down. On the ascent it does, until the buoyancy of the balloon matches the slowing potential energy as it rises (and hitting it's maximum atmospheric pressure expansion capabilities)
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