《用油膜法估测分子大小》实验成功的关键:一是如何将痱子粉撒得薄而匀,二是准确滴取一滴油酸酒精溶液,三是在油膜形成与描绘油膜轮廓过程中不要扰动油膜。为此笔者自制了三只带“孔”实验器材,有效地提高了分组实验的成功率。一、三只带“孔”器材介绍1.“孔”器材之一:顶孔匀撒器如果痱子粉膜过厚,油膜推不动痱子粉膜,容易形成“爆炸”式的星形或其他不规则形状油膜,不能形成单分子油膜层;如果痱子粉膜过薄,容易造成油膜 “Oil film method to estimate the size of the molecule,” the key to the success of the experiment: First, how to sprinkle thin and smooth prickly heat powder, and the second is accurate drop of a drop of oleic alcohol solution, the third is in the oil film formation and depiction of oil film contours do not disturb the oil film. To this end I made three with “hole ” experimental equipment, effectively improve the success rate of grouping experiments. One, three with “hole ” equipment introduction 1 “hole ” one of the equipment: Top hole spread device If the prickly heat film is too thick, the oil film can not move prickly heat film, easy to form “explosion” Type star or other irregular shape of the oil film, can not form a single molecular film layer; if the prickly heat film is too thin, likely to cause oil film