There are new and interesting adsorbents that show very high levels of adsorption on a mass basis. As one looks for viable new materials that can be moved from the bench to a pilot and then to full-scale units, a gap in adsorption results of these adsorbents immediately emerges. There has been a lack of consideration given to adsorbent density. When the transition is made from science to technology, density is critical because this variable will control the volume of the adsorbent bed and the size of the unit, both of which determine capital outlay.