A vertical glass capillary tube open at both | vedclass

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(B) For water in a glass capillary tube,the contact angle is acute,which results in a concave meniscus. To balance the weight of the water column,the

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(B) For water in a glass capillary tube,the contact angle is acute,which results in a concave meniscus. To balance the weight of the water column,the net force due to surface tension must act upwards. If the meniscus at the top is concave,the surface tension force acts upwards. If the meniscus at the bottom is also concave,the surface tension force acts downwards. However,for a stable column of water,the net upward force must balance the weight. In the case of a water column in a capillary tube,the top surface is concave (pulling upwards) and the bottom surface is also concave (pulling downwards). Wait,actually,for a water column to be supported,the net surface tension force must be upward. If both ends are concave,the net force is zero. However,in reality,the water column will form a concave meniscus at the top and a convex meniscus at the bottom to provide a net upward force to support the weight of the liquid column.

$A$ vertical glass capillary tube open at both ends contains some water. Which of the following shapes may be taken by the water in the tube?

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