Melting is the transition of a substance from a crystalline state to a liquid. The temperature at which melting occurs is called the melting point of the substance. Iron melts at 1539 ° C, and the most refractory metal, tungsten, has a melting point of 3387 ° C. Therefore, the filaments of electric lamps are made from tungsten. However, everyone knows a metal that remains liquid even at room temperature – this is mercury (its melting point is -39 ° C).
In amorphous bodies, atoms and molecules do not form a lattice, and the distance between them fluctuates within a certain interval of possible distances, therefore amorphous bodies (amber, resin, glass) do not have a melting point, the transition to a liquid state during heating occurs gradually, by softening the body … For this reason, a so-called softening temperature range is applied to such bodies.
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