melting point


melting point
Physical Chem.
the temperature at which a solid substance melts or fuses.
[1835-45]

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Temperature at which the solid and liquid states of a pure substance can exist in equilibrium.

As heat is applied to a solid, its temperature increases until it reaches the melting point. At this temperature, additional heat converts the solid into a liquid without a change in temperature. The melting point of solid water (ice) is 32°F (0°C). Though the melting point of a solid is generally considered to be the same as the freezing point of the corresponding liquid, they may differ because a liquid may freeze into different crystal systems and impurities can lower the freezing point.

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 temperature at which the solid and liquid forms of a pure substance can exist in equilibrium. As heat is applied to a solid, its temperature will increase until the melting point is reached. More heat then will convert the solid into a liquid with no temperature change. When all the solid has melted, additional heat will raise the temperature of the liquid. The melting temperature of crystalline solids is a characteristic figure and is used to identify pure compounds and elements. Most mixtures and amorphous solids melt over a range of temperatures.

      The melting temperature of a solid is generally considered to be the same as the freezing point (q.v.) of the corresponding liquid; because a liquid may freeze in different crystal systems and because impurities lower the freezing point, however, the actual freezing point may not be the same as the melting point. Thus, for characterizing a substance, the melting point is preferred. See also thermal fusion.

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Universalium. 2010.

Look at other dictionaries:

  • Melting point — Melting Melt ing, n. Liquefaction; the act of causing (something) to melt, or the process of becoming melted. [1913 Webster] {Melting point} (Chem.), the degree of temperature at which a solid substance melts or fuses; as, the melting point of… …   The Collaborative International Dictionary of English

  • melting point — melting points N COUNT: oft with poss The melting point of a substance is the temperature at which it melts when you heat it …   English dictionary

  • Melting point — Melting point. См. Точка плавления. (Источник: «Металлы и сплавы. Справочник.» Под редакцией Ю.П. Солнцева; НПО Профессионал , НПО Мир и семья ; Санкт Петербург, 2003 г.) …   Словарь металлургических терминов

  • melting point — n [U and C] the temperature at which a solid substance becomes a liquid …   Dictionary of contemporary English

  • melting point — melting ,point noun count or uncount SCIENCE the temperature at which a solid substance changes into a liquid …   Usage of the words and phrases in modern English

  • melting point — ► NOUN ▪ the temperature at which a solid will melt …   English terms dictionary

  • melting point — n. the temperature at which a specified solid becomes liquid …   English World dictionary

  • Melting point — For the physical processes that takes place at the melting point, see Melting, Freezing and Crystallization The melting point of a solid is the temperature at which it changes state from solid to liquid. At the melting point the solid and liquid… …   Wikipedia

  • melting point — noun the temperature below which a liquid turns into a solid • Syn: ↑freezing point • Hypernyms: ↑temperature * * * noun, pl ⋯ points [count, noncount] : the temperature at which something melts a metal s melting point * * * ˈmelting point [ …   Useful english dictionary

  • melting point — UK / US noun [countable/uncountable] Word forms melting point : singular melting point plural melting points science the temperature at which a solid substance changes into a liquid …   English dictionary


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