Suppose we apply a tensile/compressive stress of, say, 2 atm on a metal rod. If we consider a metal as consisting of electronic and lattice subsystems, could we say the the pressure of the conduction electrons (i.e. the electronic subsystem) is also 2 atm? If not, what is the pressure of the electronic subsystem and what determines that?
I guess that if there is such thing as pressure of conduction electrons it is something different from lattice stress.