Vapour pressure refers to the pressure that a vapor exerts when it is in a state of equilibrium with its surrounding liquid or solid. There are many synonyms for this term, including vapor tension, vapor force, vapor potential, and vapor-saturated pressure. Another related term is partial pressure, which refers to the pressure contributed by a single gas within a mixture of gases. Other synonyms for partial pressure include mole fraction pressure, gas pressure, and constituent pressure. In both cases, understanding the concept of pressure is crucial to understanding how gases and vapors interact with each other, and how they can be manipulated or measured in different settings.