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Vapour Pressure of a Pure Liquid Essay Preview: Vapour Pressure of a Pure Liquid Report this essay Vapor Pressure of a Pure Liquid: Determination of ΔvapHPhysical Chemistry 231Lab # 5Naomi CraneSarah SuttonLauren IntroductionVapor pressure is the partial pressure of a gas phase of a substance in equilibrium with its liquid or solid phase (1). Boiling.