In terms of thermal expansion, why is water unusual?

Water is unusual in terms of thermal expansion because other substances are denser in solid form and less dense in liquid form, while water is denser in liquid form and less dense in solid form. Water bonds in such a way that molecules are help farther apart in solid form than in liquid form.

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

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