Fig. 2.

Filling/emptying transition. (A) Adsorption isotherms: particle density ρ = 〈n〉/N, as a function of the scaled fugacity, z/z₀, for different system sizes. The filling transition occurs at ≈8% of the fugacity at ambient conditions. The adsorption isotherms become steeper with increasing system size. At N = 10⁴ the adsorption isotherms have reached their large system limit. (B) Relative variance of the particle number fluctuations, 〈(Δn)²〉/〈n〉 = (〈n²〉 − 〈n〉²) /〈n〉, as a function of the scaled fugacity, z/z₀, for different system sizes.