Question

I
which of the there types of packing used by
metals makes the most efficient use of space.
and which makes the least. efficient use?​

Answer 1

Close packing is maximum in the crystal lattice of Face Centered cubic (FCC) unit cell and it is minimum in the crystal lattice of Simple Cubic unit cell.

- In the crystal lattice of Face Centered cubic (FCC) unit cell {or we can say cubic close packing (ccp)} the packing efficiency is 74 %.

- In the crystal lattice of Simple Cubic unit cell, the packing efficiency is 52.4%. - In the crystal lattice of Body Centred cubic unit cell, the packing efficiency is 68%.