This transition is called phase change.
What is polymorphism ?
A substance's capacity to crystallize into various crystalline forms is known as polymorphism. These crystal changes are also referred to as polymorphs. Polymorphs behave differently in the solid state even though they are the same in the liquid or gaseous states.
Polymorphism, as used in materials science, refers to the fact that a solid material can exist in more than one crystal structure or form. Isomerism in the form of polymorphism. The phenomena can be seen in any crystalline substance. A chemical element's polymorphism is referred to as allotropy. Pharmaceuticals, agrochemicals, pigments, dyestuffs, meals, and explosives all have practical applications for polymorphism. "A reversible transition of a solid crystalline phase at a given temperature and pressure (the inversion point) to another phase of the same chemical composition with a different crystal structure," according to IUPAC, describes a polymorphic transition. Dimorphic materials have two polymorphs, trimorphic materials have three polymorphs, etc.
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