|MLA Citation:||Bloomfield, Louis A. "Question 1184"|
How Everything Works 23 Jan 2018. 23 Jan 2018 <http://howeverythingworks.org/print1.php?QNum=1184>.
The landing and leaving processes are in perpetual competition and the fastest one wins. If the air is humid and the object is cold or attractive to water molecules, the landing process dominates and water condenses out of the air and onto the object. If the air is dry and the object is hot or doesn't bind water molecules well, taking off dominates and water evaporates from the object into the air.
Your problem is that the air in your closets is very humid and landing is winning—too much water is condensing on your walls. To stop this condensation, you either have to heat the walls, so that water molecules leave them faster, or reduce the humidity of the air, so that water molecules land less often. Putting a material that binds water molecules into your closets changes the balance of landing and taking off—water molecules that land on this material don't return to the air often so the humidity of the air diminishes. With less humidity in the air, the rate at which water molecules land on the walls also diminishes.
But this drying effect only works if the air in the closet is trapped there. If your closet exchanges air quickly with outdoor air, the water molecules removed by the drying agent will be quickly replaced with new water molecules from outside. In effect, you will be trying to dry the great outdoors, a hopeless task. To make the most of this drying agent, you should let it work on as little air as possible by sealing the closet and slowing the exchange of air with outside. Better yet, replace the drying agent with a dehumidifier. A dehumidifier accumulates water molecules from the air by presenting the air with a chilled surface. Water molecules land on the cold surface and then don't have enough energy to return to the air. They are trapped by the cold rather than by chemical binding.