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一.如附图,竖直放置的一端封闭的 U 形玻璃管,右侧管子开口,它的内径为左侧管子内径的2倍。左管内用水银封闭住一定质量的空气。在大气压强为1.0×10~5帕时,左管内水银面高出右管内水银面37.5厘米,空气柱长30厘米。现设法在左管水银面下方30厘米处用小钉钉一个小孔。当拔出小钉后,(1)U 形管内的水银柱将发生怎样的
1. As shown in the figure, a U-shaped glass tube closed at one end is placed vertically, and the right tube is open. Its inner diameter is twice the inner diameter of the left tube. Mercury in the left tube closed the air of a certain quality. When the atmospheric pressure is 1.0 × 10 ~ 5 Pa, the left side mercury surface is 37.5 cm above the right side of the tube, and the length of the air column is 30 cm. Now try to nail a small hole with a small nail 30 centimeters below the left tube mercury surface. When a small nail is pulled out, (1) What happens to the mercury column in the U-shaped tube?