初中物理第二册78页图4—3液体蒸发时温度降低的实验,由于温度计可见度太小,效果不好。如果用附图改制的伽利略温度计,实验时只在烧瓶的底部涂少量的酒精,U形玻璃管内有色液体的液面出现高度差,由此证明液体蒸发时从外界吸收热量.这样改进增大了可见度,效果不错. The junior middle school physics second volume 78 pages Fig. 3-4 The experiment that the temperature drops when the liquid evaporates, because the visibility of the thermometer is too small, the result is not good. If Galileo thermometers were modified from the drawings, only a small amount of alcohol was applied to the bottom of the flask during the experiment. The height of the liquid surface of the colored liquid in the U-shaped glass tube showed a height difference, thereby demonstrating that the liquid absorbs heat from the outside when it evaporates. Such improvement is increased. Visibility, good results.