where Λ is the thermal de Broglie wavelength of the exchanged particle, N is the number of the system's exchangeable particles before the MC move, E new -E old is the total energy difference before (old) and after (new) the MC move, and µ res is the chemical potential of the particle reservoir 108 . From the difference between the total volume V and the occupied volume V occ , the accessible volume V acc is determined following