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//Variable declaration
r=0.1249; //atomic radius(nm)
n=2; //number of atoms
//Calculation
a=4*r/sqrt(3); //edge length(m)
V=a**3; //volume(nm**3)
v=4*%pi*r**3*n/3; //volume of atoms(nm**3)
Fv=V-v; //free volume/unit cell(nm**3)
//Result
printf('free volume/unit cell is %0.3f nm**3 \n',(Fv))
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