4 ms·
Is there any reason to need a concrete sphere? Couldn't a robust, durable flexible bag do the trick? My hydroflask, when compressed, will push water out :)
by mrDmrTmrJ 1y ago
Is there any reason to need a concrete sphere? Couldn't a robust, durable flexible bag do the trick?
My hydroflask, when compressed, will push water out :)
- two_handfuls 1y agoIf you pump water out of a flexible bag you are not storing energy, just shrinking the bag.