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Melting Point

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The '''melting point''' of a crystalline solid is the temperature at which it changes states of matter state from solid to liquid. When considered as the temperature of the ''reverse'' change from liquid to solid, it is referred to as the '''freezing point'''. For most substances, melting and freezing points are equal. For example, the melting point ''and'' freezing point of the chemical element element mercury (element) mercury is 234.32 kelvins (−38.83 Celsius °C or −37.89 Fahrenheit °F). However, certain substances possess differing solid-liquid transition temperatures. For example, agar melts at 85°C (185°F) and solidifies from 32 to 40°C (89.6 to 104°F); this prosess is known as hysteresis. Unlike the boiling point, the melting point is relatively insensitive to pressure. The melting point of water is 0°C (32°F, 273 K). In the presence of Nucleation nucleating substances the freezing point of water is the same as the melting point. But in the absence of nucleators water will Supercooling supercool to −42°C (−43.6°F, 231 K) before freezing. Melting points are often used to ascertain the purity of and to characterise organic compounds. The melting point of a pure substance is always higher than the melting point of that substance when a small amount of an impurity is present. The more impurity is present, the lower the melting point. Eventually, a minimum melting point will be reached. The mixing ratio that results in the lowest possible melting point is known as the eutectic eutectic point. The chemical element with the highest melting point is tungsten, at 3695 K (3422°C, 6191°F). '''Note:''' Certain materials, such as glass, may harden without crystallizing; this is called an amorphous solid.

See also
* Phase (matter) Phases of matter * Triple point * Freezing-point depression * Boiling point Category:Chemical properties af:Smeltpunt ar:نقطة انصهار bg:Температура на топене bs:TaliÅ¡te ca:Punt de fusió cs:Teplota tání da:Smeltepunkt de:Schmelzpunkt et:Sulamistemperatuur el:Σημείο τήξης es:Punto de fusión eo:Frostopunkto fa:دمای ذوب fr:Température de fusion ko:녹는ì ? hr:TaliÅ¡te id:Titik lebur is:Bræðslumark it:Punto di fusione he:נקודת התכה lv:KuÅ¡anas temperatÅ«ra lt:Lydymosi temperatÅ«ra hu:Olvadáspont mk:Точка на топење nl:Smeltpunt ja:èž?点 no:Smeltepunkt nn:Smeltepunkt pl:Temperatura topnienia pt:Ponto de fusão ro:Punct de topire ru:Температура плавлениÑ? sl:TaliÅ¡Ä?e sr:Температура топљења fi:Sulamispiste sv:Smältpunkt th:จุดหลอมเหลว tr:Erime noktası uk:Температура плавленнÑ? zh:熔点 see Melting point

*** Shopping-Tip: Melting Point