ABSTRACT
At any instant, a system may have particular values of volume, pressure, temperature, etc., which we call its macrostate. There are usually very many
different microstates (molecular velocities and individual kinetic energies) that correspond to one particular macrostate. Consider a macrostate with a certain total energy E. One possible microstate corresponding to this macrostate might be if all the energy E was concentrated in one molecule and the rest had E1 = 0. It is very unlikely that we would encounter this particular microstate, especially if we had a large number of molecules.
