在图甲所示,静止时U型管两侧液面相平;
要使得右管内液面上升,可减小右管上方的空气压强,可以使气流从U型管右边上方吹过,此时右边上方空气流速大、压强小,而左边压强不变,所以在左右两边压强差的作用下,右边液面升高.
故答案为:可以使气流从U型管右边上方吹过(其他方法合理也可).
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