4 ms·
They're talking about the density of the structure, not of the actual material the structure is made from. It's porous and non-rigid, and doesn't exclude air,
by andrewaylett 14y ago
They're talking about the density of the structure, not of the actual material the structure is made from. It's porous and non-rigid, and doesn't exclude air, so it's still got negative buoyancy in air.