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Aside from H2O, are there any substances whos solid state is less dense than its liquid state?

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Aside from H2O, are there any substances whos solid state is less dense than its liquid state?

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1) Only the usual form of solid water is less dense than its liquid state: “Hexagonal ice is less dense than liquid water whereas the other ices found in equilibrium with water are all denser with phase changes occurring on the approach of the liquid and solid densities.” Source and further information: http://www.lsbu.ac.uk/water/phase.html (Please see details about other ice phases further down) 2) “Water is the only known non-metallic substance to expand when it freezes.” “Everyday ice and snow have a hexagonal crystal structure (ice Ih). Subjected to higher pressures and varying temperatures, ice can form in roughly a dozen different phases. Only a little less stable (metastable) than Ih is the cubic structure (Ic). At other temperatures and pressures, other forms of ice exist, including II, III, V, VI, VII, VIII, IX, and X. With care all these types can be recovered at ambient pressure. The types are differentiated by their crystalline structure, ordering and density. There are al

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