The specific heat capacity and melting point of aluminium are 0.88 *103 J/(kg * C) and 660.37 respectively. The melting heat of aluminium is 3.98 x 105J/kg and the evaporation heat of aluminium is 1.05 x 107J/kg. Melting heat: Latent heat of phase transition absorbed by crystalline substances per unit mass at melting point from solid phase to liquid phase. The melting of crystals is a process in which particles are arranged irregularly instead of regularly.
These heat will be used to increase molecular gravity and potential energy. That is to say, the energy required by the absorbed heat material will destroy the lattice structure, change the thermal motion of liquid molecules in the thermal motion of the qualitative solid molecules, and change the state of materials. So the crystal not only has a fixed melting point, but also needs to absorb a certain amount of heat to melt. Because the lattice structure of crystal space varies with the material, the heat absorbed by different substances during melting is not the same, although the mass is the same.
Melting heat is used to represent this property of crystalline materials. It denotes the heat per unit mass required for a solid to melt completely into a liquid at its melting point at the same temperature; when a solid solidifies, at freezing point, it equals the heat released by the transformation of the same liquid material per unit mass into crystals. If it's the heat of fusion, or m is the mass of the material, or q is the heat required to melt, then the unit is joule per gram or joule per kilogram. The melting heat of high melting point objects is difficult to measure, while that of low melting point objects can be measured by calorimeter.
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