By making use of the relations among the various positions of the function in the cross coordinate graph, the paper presents the relations among the thermodynamic function, such as thermodynamics combined formula, Maxwell′s relational expression, etc.
利用十字形坐标图中各函数位置间的关系 ,表达了热力学联合公式、麦克斯韦关系式等热力学函数间的关系 。