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If I filled a sealed 4"x10ft pvc pipe with helium placed in in 3ft of water how long would it float?
Helium will disappear in a balloon over a few hours. If a closed container is filled with helium will it stay active and for how long? I need to ...
So...if there was an earth like planet with an atmosphere made of helium,what would happen ...
coulld you go around the every country/county on earth in a hot air balloon?