Who Discovered Capillary Action?

The first recorded observation of capillary action was by Leonardo da Vinci.

What causes capillary action?

Capillary action occurs because water is sticky, thanks to the forces of cohesion (water molecules like to stay close together) and adhesion (water molecules are attracted and stick to other substances). ... Dip a paper towel into a glass of water and the water will "climb" onto the paper towel.

What is capillarity theory?

Capillarity theory was proposed by Boehm. He suggested the xylem vessels behave like the capillary tubes. According to him, this capillarity of the vessels and the normal atmospheric pressure are responsible for the ascent of sap. Due to the surface tension of liquid molecules and adhesive forces, the liquid rises up.