Melting point: Difference between revisions
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{{Term | |||
|Display title=melting point | |||
{{ | |Definitions={{Definition | ||
|Num=1 | |||
|Meaning=The [[temperature]] at which a solid substance undergoes [[fusion]], that is, melts, changes from solid to liquid form. | |||
|Explanation=The melting point of a substance should be considered a property of its crystalline form only. At the melting point the liquid and solid forms of a substance exist in [[equilibrium]]. All substances of crystalline nature have their characteristic melting points. For very pure substances the [[temperature range|temperature range]] over which the process of fusion occurs is very small. The melting point of a pure crystalline solid is a function of [[pressure]]; it increases with increasing pressure for most substances. However, in the case of [[ice]] (and a few other substances) the melting point decreases with increasing pressure (<br/>''see'' [[regelation]]). Under a pressure of one [[standard atmosphere]], the melting point of pure ice is the same as the [[ice point]], that is, 0°C. <br/>''Compare'' [[freezing point]]. | |||
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Latest revision as of 12:11, 29 March 2024
The melting point of a substance should be considered a property of its crystalline form only. At the melting point the liquid and solid forms of a substance exist in equilibrium. All substances of crystalline nature have their characteristic melting points. For very pure substances the temperature range over which the process of fusion occurs is very small. The melting point of a pure crystalline solid is a function of pressure; it increases with increasing pressure for most substances. However, in the case of ice (and a few other substances) the melting point decreases with increasing pressure (
see regelation). Under a pressure of one standard atmosphere, the melting point of pure ice is the same as the ice point, that is, 0°C.
Compare freezing point.