Activated carbon, also called activated charcoal, activated
coal, or carbo activatus, is a form of carbon processed to have small,
low-volume pores that increase the surface area available for adsorption or
chemical reactions. Activated is sometimes substituted with active.
Due to its high degree of microporosity, just one gram of
activated carbon has a surface area in excess of 500 m2, as
determined by gas adsorption. An activation level sufficient for useful
application may be attained solely from high surface area; however, further
chemical treatment often enhances adsorption properties.