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Some molecules at the surface of a liquid at a specific temperature have higher energy enough to escape from the attractive forces of other molecules. This escaping process is evaporation. When a liquid evaporates in a closed container, the escaped gas moeclues cannot go away, and thus they produce a vapor pressure above the liquid. As the container stands, the number of molecules entering the vapor increases, and some of the gas molecules return to the liquid. This returning process is condensation. Eventually the rate of evaporation equals the rate of condensation. The container is now saturated with vapor and a dynamic equilibrium exists between the gas and the liquid. This saturated vapor pressure of a liquid is its vapor pressure.