Melting point
Melting Point
The Melting Point (pronunciation: /ˈmɛltɪŋ pɔɪnt/) is a fundamental physical property of a substance. It is the temperature at which a solid substance changes its state to liquid under standard atmospheric conditions.
Etymology
The term "Melting Point" originates from the English words "melt" and "point". "Melt" comes from the Old English "meltan" which means to dissolve, liquefy and "point" comes from the Latin "punctum" meaning puncture or hole, signifying a specific moment or position.
Definition
The Melting Point is defined as the temperature at which the solid and liquid phases of a substance coexist in equilibrium. When the entirety of the solid has melted, the temperature again rises.
Determination
The melting point of a substance can be determined by using a Melting Point Apparatus. The sample is slowly heated and the temperature at which the substance starts to melt is noted.
Related Terms
- Freezing Point: The temperature at which a liquid turns into a solid when cooled.
- Boiling Point: The temperature at which a liquid boils and turns to vapor.
- Phase Transition: The process of changing from one state (solid, liquid, gas) to another without changing the chemical composition.
- Thermodynamics: The branch of physical science that deals with the relations between heat and other forms of energy.
See Also
External links
- Medical encyclopedia article on Melting point
- Wikipedia's article - Melting point
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