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51问答网 > 托里拆利实验为什么会产生真空?为什么能测出大气压？

托里拆利实验为什么会产生真空?为什么能测出大气压？

2025-03-26 01:13:21

推荐回答（1个）

回答1：

一只手握住玻璃管中部，在管内灌满水银，排除空气，用另一只手的食指紧紧堵住玻璃管开口端把玻璃管小心地倒插在盛有水银的槽里待开口端全部浸入水银槽内时放开手指，将管子竖直固定当管内外贡液液面的高度差约为76cm时，它就停止下降，读出水银柱的竖直高度。逐渐倾斜玻璃管，管内水银柱的竖直高度不变。继续倾斜玻璃管，当倾斜到一定程度，管内充满水银，说明管内确实没有空气，而管外液面上受到的大气压强，正是大气压强支持着管内76cm高的汞柱，也就是大气压跟76cm高的汞柱产生的压强相等。

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