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应用Excel软件,研究多项式,希斯科夫斯基经验公式和对数多项式三种拟合方法处理大学物理化学实验中“液体表面张力测定”实验数据。其中,多项式拟合处理数据不好,其拟合的Γ-C曲线不符合Langmuir吸附等温式;而后两种方法拟合数据则很好,拟合的σ-C曲线分别为σ=σ_0-σ_0×b×ln(1+c/a)(a=0.5426,b=0.2154)和σ=-0.0004(lnc)~2-0.0117(lnc) +0.0549,从而求导绘出的Γ-C曲线符合要求,进一步求得乙醇分子的横截面积σ_0分别为0.3035 nm~2和0.3107 nm~2,与理论值相近。此外,还利用LabVIEW软件开发了表面张力测定虚拟仪器,界面友好,易操作,编程直观高效。
Applying the software of Excel, the polynomial, the empirical formula of Hekkovsky and the polynomial of logarithm were used to deal with the experimental data of “Liquid Surface Tension Measurement” in university physics chemistry experiment. Among them, polynomial fitting data is not good, the fitted Γ-C curve does not comply with the Langmuir adsorption isotherm; and the latter two methods fitting data is very good, the fitted σ-C curves were σ = σ_0-σ_0 (A + 0.5426, b = 0.2154) and σ = -0.0004 (lnc) ~ 2-0.0117 (lnc) +0.0549, so that the Γ-C curve drawn from the derivation meets the requirements The cross-sectional area of the ethanol molecule, σ_0, was 0.3035 nm ~ 2 and 0.3107 nm ~ 2, respectively, which was close to the theoretical value. In addition, the surface tension measurement virtual instrument has also been developed by using LabVIEW software. The interface is friendly, easy to operate and programming is intuitive and efficient.