Engineering Materials
The molecules in a solid move

In circular motion
In a random manner
Back and forth like tiny pendulums
In a haphazard way

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Engineering Materials
The unit cells

May be defined as the smallest parallelepiped which could be transposed in three coordinate directions to build up the space lattice
All of these
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

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