一、用实验验证物理规律的必要性在义务教育课程标准实验《物理》九年级人教版教材中,有两处讲到分子组成和分子热运动,并且在义务教育课程标准实验《化学》九年级人教版教材上册中也提到分子的构成。因此,学生对分子之间有一定间隔的认识难以理解,所以有必要做“1+1是否一定等于2”的演示实验。以往的讲解是例比:在一箱苹果中加入一箱大米后混合总体 I. The necessity of verifying the physical laws by experiment In the compulsory education curriculum standard experiment “Physics” in the 9th grade teaching materials, there are two places that talk about molecular composition and molecular thermal movement, and in the compulsory education curriculum standard experiment “Chemistry” nine The composition of the molecules is also mentioned in the first edition of the textbook for grade teaching. Therefore, it is difficult for students to understand the existence of a certain interval between molecules, so it is necessary to do a demonstration experiment of whether “1+1 is definitely equal to 2”. The previous explanation is an example: After adding a box of rice to a box of apples, mix the whole