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托里拆利实验测定了大气压的数值,但我认为托里拆利实验中水银柱上面并不是真空. 这个实验是这样做的:向一个一端开口的长玻璃管内注满水银,用手指堵住开口端,倒转玻璃管放进水银槽内,然后松开手,玻璃管内的水银柱就会下降,到一定程度就停止.课本上讲此时玻璃管内的水银柱上部是真空,而我认为不是这样. 我们在“热现象”中学过蒸发现象,蒸发是在任何温度下都可以进行
The Torricelli experiment measured the value of atmospheric pressure, but I think that the mercury column above the Torricelli experiment was not a vacuum. This experiment was done by filling a long glass tube with one end open and filling it with mercury. At the open end, reverse the glass tube into the mercury tank, and then release the hand, the mercury column in the glass tube will drop, to a certain extent, stop. The textbook says that the upper part of the mercury column inside the glass tube is vacuum, and I think This is not the case. We learned about evaporation in the “thermal phenomenon”. Evaporation can be performed at any temperature.