Answer:
The meniscus of mercury in a glass tube is convex. Since there exists an excess pressure \[(p=2\sigma /r)\] on the concave side of the curved liquid surface, the pressure below the meniscus is greater than the atmospheric pressure. This excess pressure has a very large value for a tube of fine bore. As the pressure of mercury inside the tube is greater than that outside it, mercury instead of entering into the tube tends to flow out.
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