The pressure at the opening of the tube is due to
atmospheric pressure + pressure due to the water at a depth of hw
At the other side of the same level as the opening of the tube, the pressure is the same but the pressure is due to
pressure of the air + pressure due to the liquid mercury of height hm
atmospheric pressure + pressure due to the water at a depth of hw = pressure of the air + pressure due to the liquid mercury of height hm
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