蒸发吸热有致冷作用,在日常生活中蒸发吸热致冷的现象随处可见。而教学中,对蒸发会吸热的科学建构,却往往落不到实处;命题中,有关“物态变化”的中考试题常因忽略“蒸发”这一条件而导致错误。分析在实验的基础上,科学建构蒸发吸热,慎重考虑蒸发致冷对物态变化的影响。 Evaporative evaporation has a cooling effect, evaporation in the daily life of the phenomenon of endothermic refrigeration can be seen everywhere. However, in teaching, the scientific construction of evaporation endothermic often falls short of actuality. In the proposition, the examination questions about “state change ” often result in mistakes because of ignoring “evaporation ”. On the basis of experiments, this study constructs the evaporation endotherm scientifically and considers carefully the influence of evaporation on the state change.