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In this prsentaion you state hat water is the only substance that is leass dense in the solid state than in the liquid state. This is not true. Other substances that expand on freezing are silicon, gallium, germanium, antimony, bismuth, plutonium and also chemical compounds that form spacious crystal lattices with tetrahedral coordination.
Hi Sean, thank you so much for reporting that error; it has been corrected in the presentation. We really appreciate your contribution to the continuous improvement of materials.