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Vapor pressure[a] or equilibrium vapor pressure is the pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases (solid or liquid) at a given temperature in a closed system. The equilibrium vapor pressure is an indication of a liquid's thermodynamic tendency to evaporate.
Jan 30, 2023 · The vapor pressure of a substance is the pressure that the gaseous part of the substance exerts on the container of said substance. Boiling a elevated altitudes. The fact that the vapor pressure is equal to the external pressure can become important when talking about boiling temperatures at various altitudes.
- Factors That Affect Vapor Pressure
- Vapor Pressure of Water
- How to Calculate Vapor Pressure
- References
The most important factors affecting vapor pressure are temperature and type of molecules: 1. Temperature: Temperature has the greatest effect on vapor pressure. As temperature increases, vapor pressure increases. As temperature decreases, vapor pressure decreases. This makes sense, as imparting thermal energy gives molecules more kinetic energy. T...
The vapor pressure of water depends on its temperature. The vapor pressure of water at room temperature (25 °C) is 23.8 mm Hg, 0.0313 atm, or 23.8 torr, or 3.17 kPa. At its freezing point (0 °C), the vapor pressure of water is 4.6 torr. At its boiling point (100 °C), the vapor pressure of water is 658.0 torr (atmospheric pressure).
There are several vapor pressure formulas, but two common ones are Raoult’s law and the Clausius-Clapeyron equation.
Perry, R.H.; Green, D.W., eds. (1997). Perry’s Chemical Engineers’ Handbook(7th ed.). McGraw-Hill. ISBN 978-0-07-049841-9.Petrucci, Ralph H.; Harwood, William S.; Herring, F. Geoffrey (2002). General Chemistry(8th ed.). Prentice Hall. ISBN 978-0-13-014329-7.Sinnot, R.K. (2005). Chemical Engineering Design(4th ed.). Butterworth-Heinemann. ISBN 978-0-7506-6538-4.Wagner, W. (1973). “New vapour pressure measurements for argon and nitrogen and a new method for establishing rational vapour pressure equations”. Cryogenics. 13 (8): 470–482. doi:10.1016/0011-2275...The vapor pressure of a liquid is the equilibrium pressure of a vapor above its liquid (or solid); that is, the pressure of the vapor resulting from evaporation of a liquid (or solid) above a sample of the liquid (or solid) in a closed container.
Vapour pressure, pressure exerted by a vapour when the vapour is in equilibrium with the liquid or solid form, or both, of the same substance—i.e., when conditions are such that the substance can exist in both or in all three phases. Learn more about vapour pressure in this article.
- The Editors of Encyclopaedia Britannica
Vapor pressure is defined as the partial pressure of a substance in the gas phase (vapor) that exists above a sample of the liquid in a closed container. The phenomenon of vapor pressure is explained by the kinetic molecular theory again, which shows that a liquid always exists in equilibrium with its vapor.
Sep 21, 2022 · Vapor pressure is a measure of the pressure exerted by a gas above a liquid in a sealed container. Strong intermolecular forces produce a lower rate of evaporation and a lower vapor pressure. Weak intermolecular forces produce a higher rate of evaporation and a higher vapor pressure.
