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人教版高中物理第二册(试验修订本必修加选修)“学生实验”中的第一个实验是“用油膜法估测分子的大小”。教材中说“实验时先往边长约为30￣40cm的浅盘里倒入约2cm深的水,然后将痱子粉或石膏粉均匀地撒在水面上,再用注射器或滴管将老师事先配好的油酸酒精溶液滴在水面上一滴,
PEP High School Physics Book 2 (Executive Revision of Compulsory and Optional) The first experiment in the “Student Experiment” was “Evaluating the size of molecules using the oil film method.” According to the textbook, “When experimenting, pour approximately 2cm deep water into a platter approximately 30cm to 40cm long, and then spread the scorpion powder or gypsum powder evenly on the surface of the water. Use a syringe or a dropper to pre-empt the teacher. A drop of oleic acid alcohol solution is dropped on the surface of the water.