What is the term for the pressure that substances in a gaseous state exert on surrounding surfaces?

The term that describes the pressure exerted by substances in a gaseous state on surrounding surfaces is known as vapor pressure. Vapor pressure is specific to the molecules in a gas phase, indicating how much pressure the vapor can exert at a given temperature. It is an important concept in various contexts, such as understanding evaporation, condensation, and the behavior of moisture in the air.

Vapor pressure occurs when a gas is in equilibrium with its liquid or solid phase, meaning the rate at which molecules evaporate from the liquid equals the rate at which they condense back into it. This concept is crucial in drying processes, as it helps to determine how quickly moisture can be removed from materials and structures.

Understanding vapor pressure is essential in applied structural drying, as it informs decisions about ventilation, dehumidification, and drying rates needed during restoration and remediation following water damage.