●●● ●●●● ●●●●● 1. Experimental purposes ●●●● ●●●●● ●●●● 1)Master the principles and methods of maximum differential pressure method for the determination of surface tension (2)Measure the surface tension of n-butyl alcohol solution and understand the concept of surface tension and influencing factors (Learn Gibbs equation and its applications.1. Experimental purposes (1)Master the principles and methods of maximum differential pressure method for the determination of surface tension. (2)Measure the surface tension of n-butyl alcohol solution, and understand the concept of surface tension and influencing factors. (3)Learn Gibbs equation and its applications