That's what I found too. So with the volume of my structure being ~1ft3, it would need to weigh 64 lbs to sink, or at least be neutral. So by hollowing out unnecessary styrofoam on the bottom, I would reduce volume, thus require less weight, correct?
I was also going to fill the space that I vacated the styrofoam from with pure concrete, to add weight. My biggest question is...will I benefit as much as I think I will by replacing styrofoam with concrete? Per the equation, I will reduce weight needed by reducing volume. But by adding concrete, I am increasing volume again, thus requiring more weight. I would imagine the weight addition would outweigh the additional buoyant force
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