Engineering Materials
Amorphous material is one

In which atoms align themselves in a geometric pattern upon solidification
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
Which is not attacked by phosphorous

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Engineering Materials
Steel contains

Alloying elements like chromium, tungsten nickel and copper
50% or more iron
80% or more iron
Elements like phosphorus, sulphur and silicon in varying quantities

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Engineering Materials
The unit cells

Have the same orientation and their similar faces are parallel
Contain the smallest number of atoms which when taken together have all the properties of the crystals of the particular metal
May be defined as the smallest parallelepiped which could be transposed in three coordinate directions to build up the space lattice
All of these

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