现行初三物理课本第79页水的降压沸腾的实验装置是用烧瓶、抽气筒和细管组成,实验演示时细管与瓶橡皮塞,橡皮塞与烧瓶口之间连接密封比较困难;整个装置又不便在课间移动,可见度比较小。教学实践中,我们采用医用注射器(50毫升)和小橡皮帽,进行演示,简单易做,且效果很好。现介绍下: 用一只50毫升注射器,找一只眼药水瓶小 The current third-year physics textbook, page 79 water hypotonic boiling experimental device is the use of flasks, pumping tube and thin tube composition, the experimental demonstration of thin tube and bottle rubber stopper, rubber stopper and the connection between the mouth of the flask more difficult; the whole Devices and inconvenient to move between classes, visibility is relatively small. Teaching practice, we use medical syringes (50 ml) and small rubber cap, to demonstrate, easy to do, and the effect is very good. Now introduce: use a 50 ml syringe, find an eye drops small