Chlorine gas
The exchange surfaces are moist.
I wonder who said it did. Did he realise that some gases might weigh more than the water which is contained in moist gases?
The gases are to dissolve and diffuse through.
Colorless , but exposure to moist air gives white fumes.
Surfactant
Oil it!! and if necessary, keep oiling it :)
warm gas
Amphibians are known for having moist skin, as it helps with gas exchange through their skin. Some examples include frogs, toads, and salamanders.
Plants.
they are connected to a densed network of blood vessels which keeps the oxygen moist
When the solid pelets were exposed to a warm, moist enviroment they would sublimate, which is why in winter the Germans had to provied portable heaters into the gas chambers.