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- vapor pressure
- The pressureForce per unit area; in gases arising from the force exerted by collisions of gas molecules with the wall of the container. (or partial pressureThat portion of the total pressure of a mixture of gases contributed by the presence of one of the component gases.) exerted by the gaseous form of a substanceA material that is either an element or that has a fixed ratio of elements in its chemical formula. in equilibriumA state in which no net change is occurring, that is, in which the concentrations of reactants and products remain constant; chemical equilibrium is characterized by forward and reverse reactions occurring at the same rate. with the liquidA state of matter in which the atomic-scale particles remain close together but are able to change their positions so that the matter takes the shape of its container form.