Permeability is a physical quantity that describes how easily a substance allows another substance to pass through it. It is a measure of the ability of a material to transmit a fluid or gas.

Common units used to measure permeability include meters per second (m/s), centimeters per second (cm/s), and millimeters per second (mm/s).

• Permeability is crucial in the field of geology for understanding the flow of fluids through rocks and soil.
• It is also important in the study of materials science for designing membranes and filters.
• Permeability plays a significant role in the field of civil engineering for evaluating the effectiveness of drainage systems.
• Understanding permeability is essential in the pharmaceutical industry for drug delivery systems.