Use of thermo_style fnorm command

Hi all,

Lammps page for thermo_style describes fnorm as length of force vector for all atoms. In case, during my simulation, I apply force (say 10 eV/A) on my simulation box only in one direction (z-axis). Then should the fnorm value be a measure of that applied force, i.e should it be a value close to 10eV/A.

Or does fnorm sums up the force vector on each atom individually?

Thanks and Regards,

The force vector for all atoms has 3N components.
Fnorm is the "length" of that vector, or the 2 norm,
which if N = 1 would be sqrt(fx*fx + fy*fy + fz*fz).
So it will not be 10 if N is big.