i just wanted know whether LAMMPS contain that option or not.
what kind of phase your system is in, has nothing to do with the MD
code itself. whether your system is a gas or a solid at a given time
depends on the selection of potentials and simulation parameters.
perhaps you need to start with reading a text book on MD first, as
that would help you to understand why this doesn't matter.
p.s.: please always keep the mailing list in cc. thanks.