以尿素、甲酰胺和乙酰胺为溶质，二甲基甲酰胺和二甲基亚砜为溶剂；或以二甲基甲酰胺、二甲基亚砜为溶质，以甲酰胺为溶剂，通过测定溶液在２９８．１５Ｋ下的密度数据，求得了溶质的表观摩尔体积以及与溶质－溶质相互作用相关的体积第二维里系数．利用定标粒子理论讨论了溶质分子的几何体积、溶质－溶剂相互作用对溶质偏摩尔体积的影响，结果表明，溶质的溶剂化与溶质－溶质相互作用的体积效应呈相反的变化趋势 Using urea, formamide and acetamide as solutes, dimethylformamide and dimethylsulfoxide as solvent, or dimethylformamide, dimethylsulfoxide as solute and formamide as solvent, measuring solution At a density of 298.15K, the apparent molar volume of the solute and the volume second Virial coefficient associated with the solute-solute interaction were determined. The influence of solute-solvent interaction on the partial molar volume of solute was discussed by using the theory of scaled particle theory. The results showed that the volume effect of solute solvation and solute-solute interaction showed the opposite trend