An image of two beakers and a tube is shown. The first beaker, drawn on the left and labeled ``Water,'' is drawn half-full of a blue liquid. Two tubes are placed vertically in the beaker and inserted into the liquid. The liquid is shown higher in the tubes than in the beaker and is labeled ``Capillary attraction.'' The second beaker, drawn in the middle and labeled ``Mercury,'' is drawn half-full of a gray liquid. Two tubes are placed vertically in the beaker and inserted into the liquid. The liquid is shown lower in the tubes than in the beaker and is labeled ``Capillary repulsion.'' Lines point to the vertical tubes and label them ``Capillary tubes.'' A separate drawing of one of the vertical tubes from the first beaker is shown on the right. A right-facing arrow leads from the liquid in the tube to a square call-out box that shows a close-up view of the liquid's surface. The distance across the tube is labeled ``2 r'' in this image.