Vapor pressure

Vapor pressure is the force exerted by the molecules of a liquid as they escape into the air in the form of vapor. When a liquid is in a closed container, some molecules constantly move into the vapor phase, creating this pressure. The higher the vapor pressure, the more easily the liquid's molecules escape, which is influenced by temperature and the nature of the liquid. For example, liquids with high vapor pressure evaporate more quickly and boil at lower temperatures. Vapor pressure helps explain phenomena like evaporation, boiling points, and how substances transition between liquid and gas states.