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人民教育出版社出版的《初中物理演示实验》关于液体蒸发时温度降低的实验 ,做法都是先用一支温度计测出刚打开瓶塞的乙醚 (或酒精 )的温度 ,得出它与室温相同。再在温度计玻璃泡上包上醮有乙醚 (或酒精 )的棉花 ,让学生看到温度计的示数逐渐下降 ,而得出“液体蒸发时温度降低
In the experiment of “lower temperature of liquid evaporation” published by the People’s Education Press, the temperature is measured by the use of a thermometer to measure the temperature of the ether (or alcohol) that had just opened the stopper and to obtain the same temperature as the room temperature. . Then put a piece of cotton with ethyl ether (or alcohol) on the glass bulb of the thermometer, and let the student see the thermometer’s indicator gradually decrease, which leads to the "lower temperature when the liquid evaporates.