Question

how to calculate packing eficiency?? of scp

Answer 1

Packing fraction= Vol.occupied/Vol.available
                         =Vol. of all sphere/Vol.of cube
                         =ENA*Vol.of one sphere/Vol.of cube
 So, for SCP
Packing Fraction= 1*4/3$\pi$r^3/a^3
                           =$\pi$/6
                          =52%

Where,
r=radius of the sphers
a=Edge length