Vapor refers to a gas or substance in the air that can be seen or felt, like steam or fog. It is created when a liquid or solid turns into gas form. Full definition
I certainly never said individual positive feedbacks don't exist, and even mentioned some related to climate, such as ice albedo and increases in water vapor in air. (climate-skeptic.com)
Most troubling initially was the effective omission of water vapor as a greenhouse gas (Figure 1). (drtimball.com)
The plastic vapor barrier on the sand floor never lets the crawl space dry out. (rismedia.com)