Systems that harvest water from the air can make drinking water. But the same tool can remove humidity from the house's internal air.

Harvesting water straight from the air is one of the most important things if people want to survive in deserts. But the same systems can use to make drinking water in normal city areas. Those systems that harvest water from the air can keep the air clean and dry in places like computer centers. 

MIT researchers made the new hydrogel. That hydrogel called lithium chloride can harvest lots of water from the air. And that kind of system can use to make at least drinking water. But those systems also can remove water from the air. And they are useful to keep places like computer centers dry and clean. 

The reason, why there is no rain in the desert is that there are no particles in the air that allows water or vapor to condensate around them. In the first world war, the particles that burning gunpowder sent into the air caused rain that turned all land into mud.

"MIT engineers have synthesized a new superabsorbent hydrogel infused with lithium chloride that can absorb an unprecedented amount of moisture, even in desert-like conditions. This material has the potential for large-scale use in passive water harvesting and improving air conditioning efficiency. (Artist’s concept.)" (ScitechDaily.com/Harvesting Water From Desert Air: MIT’s Revolutionary Superabsorbent Hydrogel)

"MIT engineers have synthesized a superabsorbent material that can soak up a record amount of moisture from the air, even in desert-like conditions. Pictured are the hydrogel discs swollen in water. Credit: Gustav Graeber and Carlos D. Díaz-Marín" (ScitechDaily.com/Harvesting Water From Desert Air: MIT’s Revolutionary Superabsorbent Hydrogel)

The rain was the reason for many catastrophes. As an example, the Passchendaele campaign turned to muddy hell the rain. The artillery and other weapons pumped small particles into the air. Along with pressure waves and changing temperature, that thing caused rain because water condensates around those particles. 

In some visions, the artificial rain would create by burning gunpowder and then cooling that smoke. Then the system will make the artificial occlusion front by using very cold particles. That thing should cause artificial rain around that statue of very cold particles. 

In more limited solutions those particles will release into the chamber. And then air will put to travel through that system. Harvesting water from the air could solve water problems in at least some areas. That kind of system can install in houses. And also in places like spacecraft and submarines, the system can remove water from the air. 

Harvesting water from the air is not a new idea. There is only one needed tank there are particles like small-scale dust, like carbon powder. Then the temperature in that tank will change. And that should form of fog. Also if those particles temperature is low they would pull water on them. Sometimes is planned to harvest water from the air by using two membranes. 

The temperatures in those membranes are different. And that creates the sealing line between them. That point where hot and cold air touching each other forms clouds if the system changes that temperature simultaneously. 

https://scitechdaily.com/harvesting-water-from-desert-air-mits-revolutionary-superabsorbent-hydrogel/?expand_article=1