what is the equation to find an element's melting point
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he melting point (or, rarely, liquefaction point) of a substance is the temperature at which it changes state from solid to liquid at atmospheric pressure. At the melting point the solid and liquid phase exist in equilibrium. The melting point of a substance depends on pressure and is usually specified at standard pressure. When considered as the temperature of the reverse change from liquid to solid, it is referred to as the freezing pointor crystallization point. Because of the ability of some substances to supercool, the freezing point is not considered as a characteristic property of a substance.
When the "characteristic freezing point" of a substance is determined, in fact the actual methodology is almost always "the principle of observing the disappearance rather than the formation of ice", that is, the melting point.
There is no general equation for melting points and boiling points that applies to all elements. However, the melting point for gallium has been studied in considerable detail because gallium's melting point has been adopted as a calibration standard. Isotech, a calibration company posted the following:
"2.3 The temperature of the melting point equilibrium of pure gallium depends upon the ambient pressure of the surrounding environment, and varies with atmospheric pressure expressed upon the surface of the gallium column as follows:
t C = 29.7646 +/- (-0.002 C per std. atmos.) Eq. 2
(The negative sign of the coefficient is a result of the solidus expansion (liquidus contraction)."
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he melting point (or, rarely, liquefaction point) of a substance is the temperature at which it changes state from solid to liquid at atmospheric pressure. At the melting point the solid and liquid phase exist in equilibrium. The melting point of a substance depends on pressure and is usually specified at standard pressure. When considered as the temperature of the reverse change from liquid to solid, it is referred to as the freezing pointor crystallization point. Because of the ability of some substances to supercool, the freezing point is not considered as a characteristic property of a substance.
When the "characteristic freezing point" of a substance is determined, in fact the actual methodology is almost always "the principle of observing the disappearance rather than the formation of ice", that is, the melting point.
There is no general equation for melting points and boiling points that applies to all elements. However, the melting point for gallium has been studied in considerable detail because gallium's melting point has been adopted as a calibration standard. Isotech, a calibration company posted the following:
"2.3 The temperature of the melting point equilibrium of pure gallium depends upon the ambient pressure of the surrounding environment, and varies with atmospheric pressure expressed upon the surface of the gallium column as follows:
t C = 29.7646 +/- (-0.002 C per std. atmos.) Eq. 2
(The negative sign of the coefficient is a result of the solidus expansion (liquidus contraction)."
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anu522:
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