Percentages of free space in cubic close pack | vedclass

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(B) Packing fraction is defined as the ratio of the volume of the unit cell that is occupied by the spheres to the volume of the unit cell.The packing

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$26 \%$ and $32 \%$

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(B) Packing fraction is defined as the ratio of the volume of the unit cell that is occupied by the spheres to the volume of the unit cell.The packing efficiency for $ccp$ (cubic close packed) is $74 \%$,so the free space is $100 \% - 74 \% = 26 \%$.The packing efficiency for $bcc$ (body-centered cubic) is $68 \%$,so the free space is $100 \% - 68 \% = 32 \%$.Therefore,the percentages of free space in $ccp$ and $bcc$ are $26 \%$ and $32 \%$ respectively.

Percentages of free space in cubic close packed structure and in body centered packed structure are respectively

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