Percentage of free space in BCC unit cell is
(A) 32%
(B) 34%
(C) 28%
(D) 30%
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the correct answer is A) 32%.
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Percentage of free space in BCC unit cell is A) 32%.
The ratio of volumes in unit cell occupied by atoms to the total unit cell volume is referred to as the packing fraction or packing density. For cubic structure centered around the body,
Packing fraction = 68% of the unit cell is occupied by atoms.
The atoms are occupied nearly about 68% of the total volume in the unit cell. Accordance to the packing fraction, about 32% of space is free space.
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