system
Given the following post, respond as if you're commenting on Reddit:
human
If there are stick liquids and sticky solids, are there any sticky gasses?
gpt
Molecularly, yes. Different gases have different binding affinities to different surfaces. Binding very weakly is called physisorption, binding very strongly so there’s nearly a chemical bind is call chemisorption. How sticky the gas is depends on the gas and the surface it’s sticking to, just like liquids and solids. 

I work with scientific instruments under high vacuum and can watch (using the instrument) as water slowly gets removed from the system. What’s happening there is that water molecules in the gas phase (because of such a high vacuum in the system) are binding to the metal surfaces inside the instrument and slowly release. If we can heat some of the surfaces the water unbinds faster. This is physisorption. 

Other molecules like hydrogen sulfide, which is a gas at room temperature and atmospheric pressure, will much more strongly bind to metals like stainless steel. This is close to and may be chemisorption. Ammonia can have similar behavior. 

I also used to do research trying to make materials that would bind hydrogen gas (one of the least “sticky” gases!) More strongly, but not so strongly that it chemically reacted. It’s a very difficult sweet spot.