what does " rmass " mean in atom.cpp???


I want to add a new compute in lammps, but I have found two “mass” in lammps, one is the normal mass for each atom, the other is “rmass”. What does " rmass " meam in lammps???


mass is a per-type mass, rmass is a per-atom mass

Most atom styles use the per-type mass. A couple
atom styles define a per-atom mass, like atom_style
sphere and ellipsoid.