Engineering Materials
Points of arrest for iron correspond to

Stages at which further heating does not increase temperature for some time
Stages at which properties do not change with increase in temperature
There is nothing like points of arrest
Stages at which allotropic forms change

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Engineering Materials
Amorphous material is one

Which is not attacked by phosphorous
In which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid
Which emits fumes on melting
In which atoms align themselves in a geometric pattern upon solidification

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