I mean i would say yes because scientists have claimed there are ancient alien culture technology that may exist on the earth its hard to explain this so here is a video i found https://www.aol.com/article/news/2017/04/27/scientist-claims-signs-of-ancient-alien-technology-exist...
Buoyancy I believe.
."the ability or tendency to float in water or air or some other fluid."-google.
Hello
So the molar mass of a Hydrogen molecule is 2. If you have 10 grams of Hydrogen molecules, you have 5 moles<span> of Hydrogen molecules (10 moles of Hydrogen atoms). Avogadro's number is 6.0225x10^23. This means that </span>one mole<span> of a substance has that many particles.
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Have a nice day