初中物理课本中的“比热”演示实验装置,由于用温度计来显示水和煤油的温度变化,可见度很小,大大影响了实验效果。本人用如下办法进行改进,效果颇为满意。取相同的50毫升的平底小烧瓶两个,相同的细长玻璃管两支、相同的橡皮塞两只和红色棉线四小段,做成如附图所示的相同的空气温度计两个,即在50毫升的平底小烧瓶上用橡皮塞装上一根几形细玻璃管,在管中水平部分注进一段一 The “specific heat” demonstration experiment device in the junior high school physics textbook shows the temperature change of water and kerosene with a thermometer, and the visibility is very small, which greatly affects the experimental results. I used the following methods for improvement and the results were quite satisfactory. Take the same 50 ml flask with two small flat bottoms, two identical slender glass tubes, two identical rubber stoppers, and four small red cotton threads to make the same two air thermometers as shown in the drawing. A 50 ml flat-bottomed flask was fitted with a rubber plug on a thin glass tube and a horizontal section of the tube was filled with a