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A German Experiment Proved That Simple Concrete Spheres Make Fantastic Batteries. Now, California Plans To Submerge A 9-Meter Diameter Sphere In The Ocean And Is Already Planning Versions Of 30 Meters (farmingdale-observer.com)

submitted 1 month ago by [email protected] to c/[email protected]

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[–] [email protected] 9 points 1 month ago (1 children)

Perfect guess ! (afaik) ρ(concrete) ≈ 2.5 tons/m³
so full sphere ≈ (2.5 x 382) tons = 955 tons
they have 400 t so the cavity removes :
955 - 400 = 555 t ... so 7.51m diam. cavity
... so, yes 3/4m thick wall 😌👍 !

[–] [email protected] 4 points 1 month ago* (last edited 1 month ago)

That's exactly the way I would have calculated it, glad someone beat me to it though. Thanks!