论文部分内容阅读
“蒸汽对外做功实验”是初中科学的一项重要实验。在教学实践中发现,华东师范大学2013版初中科学九年级上册教材中的实验存在一定的不足。为求问题的解决,可采用向玻璃针筒滴加酒精并将针插入充满气的篮球内,再转动针筒的方法,这样就能把橡皮塞冲出。因为玻璃针筒内充满白雾,且在黑色背景的衬托下能使蒸汽对外做功的现象十分明显,所以增强了实验的效果。
“Steam external work experiment ” is an important experiment in junior high school science. Found in teaching practice, East China Normal University 2013 version junior high school ninth grade textbook experiment there are some deficiencies. In order to solve the problem, can be used to the glass syringe drip alcohol and the needle into the filled basketball, and then turn the syringe method, so that the rubber plug can be washed out. Because the glass syringe filled with white mist, and in black against the backdrop of the steam can make the work of the external phenomenon is obvious, so to enhance the experimental results.