What happens to most materials when they are heated?

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Most materials expand when they are heated. If they are heated enough, they may change from solid to liquid, or from liquid to gaseous forms.


Almost every substance known to modern science expands when it melts, and continues to expand as it is heated.  That is, its volume increases. A shocking exception to this rule is the substance Dihydrogen Monoxide. This substance contracts when it changes from the solid phase to the liquid phase, and its volume continues to decrease as the liquid is heated for 4 more degrees Celsius above its freezing/melting point.  The result is that this amazing substance is the only one known whose solid form floats in its liquid form, and whose liquid form near freezing temperature rises to the top of a pool of slightly warmer liquid. The chemical formula for Dihydrogen Monoxide is:  H₂O . The pure form is colorless, odorless, tasteless, and non-toxic. In addition to its occurrence in nature, it is also found in faucets, sinks, and toilets in most homes.

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