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RE: Results for the Physics challenge #1 - Up!!
Another fun thing about this was learning new things, like:
Hydrogen gas is just a little lighter than helium gas. I thought the difference would be greater.
Both gases are very much lighter than hot air. I didn't know the difference is so much.
There are other possibilities, like a plasma, vacuum, etc.
Houses typically weigh about 40K to 70K kg.
This is exactly the idea beyond such open problems. Thanks for your participation :)