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一、为什么说托管内水银柱是外界大气压支持的？为什么认为托管内水银柱产生的压强正好等于外界的大气压？答这两个问题，可用如下两个实验解释清楚．一是给密闭的水银血压计加压（打气），水银柱慢慢上升；减压（放气），水银柱缓缓下降；停止时，水银柱高度稳定不变，这说明?
1. Why is the hosted mercury column supported by outside atmospheric pressure? Why do you think that the pressure generated in the hosted mercury column is exactly equal to the external atmospheric pressure? Answer these two questions, which can be explained by the following two experiments. One is to pressurize (enclose) the closed mercury sphygmomanometer, and the mercury column slowly rises; the decompression (deflation) causes the mercury column to slowly descend; when it stops, the mercury column is highly stable and stable.