液体汽化时要吸收热量,同时本身温度降低,这是生产和生活中经常遇到的问题,如致冷设备就是根据这个道理制成,故做好此实验是很重要的。初三物理课本中此传统实验做法,温度下降幅度小,时间较长。如果改用下法做此实验,则效果较佳。 When the liquid vaporizes, it absorbs heat, and at the same time, its temperature decreases. This is a problem often encountered in production and life. For example, the cooling equipment is made according to this principle, so it is very important to do this experiment. In the traditional third-grade physics textbook, the temperature dropped slightly and the time was longer. If you use the following method to do this experiment, the effect is better.