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[–] 15 points 2 weeks ago (2 children)

Well, 4 litres of water weigh 4kg of course, I'm guessing silicon must be slightly heavier, so that's 8kg+ of weight on top your spine...

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  • [–] 12 points 2 weeks ago

    not much, it's not pure silicon but mostly saline caught in a silicone matrix.

    https://pmc.ncbi.nlm.nih.gov/articles/PMC4174160/ says density is between 1.03 - 1.07 g/ml, resulting in only 120-280 g more than pure water.

    Only gripe with this study seems for me that these were measured at standard lab conditions @ 20°C, while they will be at body temperature while in use, maybe changing density. But the mass stays the same, so for our chat here that isn't that important.

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