Engineering Materials
The unit cells

Have the same orientation and their similar faces are parallel
All of these
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

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Engineering Materials
Combined carbon in iron makes the metal

Soft and gives a fine grained crystalline structure
Soft and gives coarse grained crystalline structure
Hard and gives a coarse grained crystalline structure
Hard and gives a fine grained crystalline structure

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