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一、明确实验目的教科书对本节实验目的的表述是〔目的〕观察沸腾现象和水沸腾时的温度。这种表述方式简单明确，概括性强，教师要做好这个实验，则必须有更为具体明确的目的。根据大纲规定的“教学要求”（“知道沸腾现象”、“理解沸点、沸点与压强的关系”和“知道沸腾过程
I. Explaining the purpose of the experiment The textbook description of the purpose of the experiment in this section is [purpose] to observe the boiling phenomenon and the temperature at which the water boils. This form of presentation is simple and clear, and it has a strong generality. Teachers must do a good job in this experiment and must have a more specific and clear purpose. According to the “teaching requirements” (“know boiling phenomenon”, “understand boiling point, boiling point and pressure relationship”) and “know the boiling process”