Originally Posted by
noparlpf
It's possible their numbers are way off, or they're using something completely non-mercury. Oh hey, I just remembered--gallium is a liquid at just above room temperature (29.77°C), which is probably Indian room temperature if my Indian friends describe the heat at all accurately. And the density would be right, 5.91g/cc as a solid at room temperature. (Though it's apparently denser as a liquid at its melting point, like water...so it's possible that it would be a wee bit less dense in a pool of cool water. Still, about the 6g/cc I estimated. Perfect.