Why do crystalline solids have definite heat of fusion whereas amorphous do not?

Crystalline solids have same properties in all direction of the crystal, they have a regular and repetitive arrangement of constituent particles, and thus a sharp melting point. They do not flow before melting. Hence, they have definite heat of fusion.

Whereas, amorphous solids do not have a regular pattern of constituent particles and thus do not have a sharp melting point. They melt over a range of temperature and start to flow without completely changing into liquid. Hence, they do not have definite heat of fusion.

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crystalline solids have sharp melting pt. or short range melting pt. b z of regular and repetitive arrangement of constituent particles and these things are opposite in case of amorphous solids
that's why crystalline solids have definate enthalpy of fusion
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