Answer:
a 1-mm wide capillary inserted vertically into the water
Explanation:
When you introduce the capillary tube upright in the liquid and observe how the height of liquid in the capillary increases as time goes by.
When the liquid of viscosity h, ascends through the capillary tube of radius r, we will assume that it flows in a laminar regime, we apply the Poiseuille law.
When the pressure difference becomes zero, Dp = 0, the equilibrium situation studied in the previous section is reached. The liquid stops ascending through the capillary tube. The height at which the liquid rises is maximum when the capillary is 1 mm thick and is introduced vertically into the water
