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Capillary action is the process of a liquid wicking up a tube of small diameter, or capillary, when the capillary is placed into the liquid. Capillary action is at work when plants draw water from their roots into their leaves, when a cotton towel is used to dry off skin, and a paper towel absorbs a spill on the kitchen floor. A glass capillary is placed in a bowl of water. Into what type of capillary will the water rise to the highest level, measured vertically from the surface of the water?