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在教学中经常发现学生把题解错,其中原因之一就是学生只注重套用公式,不注重物理过程的分析所致。现剖析一例,说明分析物理过程的重要性。【例题】开口向上竖直放置的长为α厘米的玻璃管,在温度为 T_0开、大气压强为 p_0厘米汞柱时,长为 l 厘米的水银在管内封闭了一部分空气,水银面距管口为 b 厘米,见图1.问:1.温度升高到多少时,水银开始外溢。2.水银外溢的过程中,最高温度是多少?解:1.水银在上移到外溢过程中,被封闭的空气发
Often found in teaching students to solve the wrong questions, one of the reasons is that students only pay attention to apply formulas, do not pay attention to the analysis of the physical process. An example is now analysed to illustrate the importance of analysing the physical process. 【Experimental】 Glass tube of α cm length placed vertically upwards, when the temperature is T_0 open and the atmospheric pressure is p_0 cmHg, a mercury with a length of lcm closes a part of air in the tube, and the mercury is away from the nozzle For b centimeters, see Figure 1. Q: 1. When the temperature rises, mercury begins to spill. 2. What is the maximum temperature in the process of mercury spillover? Solution: 1. During the process of mercury spillover, the closed air is emitted.