What is porosity and capillary action?

Porosity is the measure of empty spaces (pores) in a material, like soil or rock, which can hold water or air. Capillary action is the ability of a liquid to flow against gravity in a narrow space, such as through a small tube or spaces in a porous material due to cohesion and adhesion forces between liquid molecules and the material surface. Together, porosity and capillary action play essential roles in various natural processes, like water movement in soil or plants.