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What is vapor pressure?

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... vapor pressure pressure exerted by a vapor that is in equilibrium with its liquid. A A liquid standing in a sealed beaker is actually a dynamic system: some molecules of the liquid are evaporating to form vapor and some molecules of vapor are condensing to form liquid. At equilibrium the rates of the two processes are equal and the system appears to be stationary (see chemical equilibrium ). The vapor, like any gas, exerts a pressure, and this pressure at equilibrium is called the vapor pressure.

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