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Enthalpies of melting and boiling for pure elements versus temperatures of transition, demonstrating Trouton's rule. In thermodynamics, the enthalpy of fusion of a substance, also known as (latent) heat of fusion, is the change in its enthalpy resulting from providing energy, typically heat, to a specific quantity of the substance to change its state from a solid to a liquid, at constant pressure.
J.A. Dean (ed), Lange's Handbook of Chemistry (15th Edition), McGraw-Hill, 1999; Section 6, Thermodynamic Properties; Table 6.4, Heats of Fusion, Vaporization, and Sublimation and Specific Heat at Various Temperatures of the Elements and Inorganic Compounds
There are four types of enthalpy changes resulting from a phase transition. To wit: Enthalpy of transformation. This applies to the transformations from one solid phase to another, such as the transformation from α-Fe (bcc ferrite) to -Fe (fcc austenite). The transformation is designated ΔH tr. Enthalpy of fusion or melting.
J.A. Dean (ed.), Lange's Handbook of Chemistry (15th Edition), McGraw-Hill, 1999; Section 6, Thermodynamic Properties; Table 6.4, Heats of Fusion, Vaporization, and Sublimation and Specific Heat at Various Temperatures of the Elements and Inorganic Compounds
However, further heat needs to be supplied for the melting to take place: this is called the heat of fusion, and is an example of latent heat. [ 10 ] From a thermodynamics point of view, at the melting point the change in Gibbs free energy (ΔG) of the material is zero, but the enthalpy ( H ) and the entropy ( S ) of the material are increasing ...
Examples: heat of vaporization or heat of fusion). For hydrogen, the difference is much more significant as it includes the sensible heat of water vapor between 150 °C and 100 °C, the latent heat of condensation at 100 °C, and the sensible heat of the condensed water between 100 °C and 25 °C.
Heat of fusion: 3.281 kJ/mol : Heat of vaporization: 231.8 kJ/mol : Molar heat capacity: ... Indium is a chemical element; it has symbol In and atomic number 49.
where is the enthalpy of fusion. Since this is a thermodynamic equation, the symbol T {\displaystyle T} refers to the absolute thermodynamic temperature , measured in kelvins (K). Equilibrium occurs when the temperature is equal to the melting point T = T f {\displaystyle T=T_{f}} so that