Q. A device which would not work on the Moon is
Solution:
Siphons do not work exclusively because of gravity, siphons also rely on background pressure. If you have cavitation of your fluid within the siphon tube, it ceases to work properly.
In the open pico-atmopshere/fempto-atmosphere of the moon, it is impossible for any liquid to exist, and even if liquid did exist…there wouldn’t be any significant background air pressure to push the liquid up over the top of the siphon tube, and your trick wouldn’t work.
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