what is permeability, and how does it differ from porosity?
Is there a direct relationship between the two? Materials: a thick sponge fine gravel a graduated cylinder beaker of water two identical clear plastic cups with vertical sides two identical tubes of similar diameter to cups fine-mesh screen (that gravel does not pass through) electrical tape or duct tape knife or fine saw to cut sponge black marker pan to catch water a stopwatch Procedure: Cut piece of sponge to diameter of clear plastic cup and insert into cup, filling to a level that should then be marked on the plastic cup (see Fig. 1a). Place a mark on the second cup at the same level as that marked on the cup with the sponge in it. Fill the second cup with water to the level of the mark. To determine the volume of the cups up to the marked levels, pour the water from the second cup into the graduated cylinder, and record this volume, which is Vm, the volume that will be filled by sponge plus pore space or gravel plus pore space. Leave the water in the cylinder. Fill the second, no
