Engineering Materials
Amorphous material is one

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

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Engineering Materials
In process annealing, the hypo eutectoid steel is

Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
Heated below or closes to the lower critical temperature and then cooled slowly
Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air
Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace

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