Wood cells of comparatively large diameter that have open ends and are set one above the other to form continuous tubes. The openings of the vessels on the surface of a piece of wood are referred to as pores.
Very small open spaces in a rock or granular material, including the complex network of channels in the interior of a particle, such as those within an ion exchange resin bead or an activated carbon granule.
The quality of having pores, one of the factors that contributes to the permeability of concrete. MetaMaxÂ® reduces porosity by making calcium hydroxide insoluble so it can not leach out of concrete and, in doing so, create pores.
Spaces between the mineral grains of a soil. The size, shape and arrangement of soil pores determines the rates of water and air movement into and through the soil. They also control the amount of available water that a soil can store for plant use.