格点气体模型与Flory近似

LATTICE GAS MODEL AND THE FLORY APPROXIMATION

格点气体模型在统计热力学中有重要意义,通常在研究这一模型时采用精确的组合公式,计算较为复杂,本文证明,对格点气体模型可采用Flory近似,计算简单,且可得出与精确公式相同的结果。在讨论过程中,我们还对Costas的一个公式进行了改正。

Usually, in the manipulation with the lattices gas model, the exact combinatory formula is used and the calculationis is a little involved. In this note, it is shown that when the Flory approximation is applied to this combinatory formula, the calculation is simplified, and the same results is obtained just as the exact combinatory formula is used. Meanwhile an error in the Costas formula is corrected.