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The vapor pressure of water is the pressure exerted by molecules of water vapor in gaseous form (whether pure or in a mixture with other gases such as air). The saturation vapor pressure is the pressure at which water vapor is in thermodynamic equilibrium with its condensed state.
Online calculator, figures and tables with water saturation (vapor) pressure at temperatures ranging 0 to 370 °C (32 to 700°F) - in Imperial and SI Units. Water tends to evaporate or vaporize by projecting molecules into the space above its surface.
With this vapor pressure of water calculator, you can find the vapor pressure at a particular temperature according to five different formulas. This calculator works for the standard 0-100 °C range as well as temperatures above 100 °C and below the freezing point.
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.
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).
At 393 K the vapor pressure of water is 1489 mmHg; what is the vapor pressure of water at 343 K? A solution's partial pressure is 34.93 mmHg. This solution is comprised of Chemical A and Chemical B.
The vapor pressure of water is the pressure at which the gas phase is in equilibrium with the liquid phase. The high surface tension of water (water "sticks" to itself, so it doesn't "want to" evaporate) means water has a low vapor pressure.
The vapor pressure of water is the pressure at which water vapor is in thermodynamic equilibrium with its condensed state . At higher pressures water would condense. At this equilibrium condition the vapor pressure is the saturation pressure . The figures and tables below summarize the thermophysical properties of water and steam at equilibrium.
At a pressure greater than 1 atm, water boils at a temperature greater than 100°C because the increased pressure forces vapor molecules above the surface to condense. Hence the molecules must have greater kinetic energy to escape from the surface.
Water vapor pressure is the pressure exerted by water vapor molecules in the gaseous state. It is directly influenced by temperature: as temperature increases, the kinetic energy of water molecules increases, and more molecules transition from the liquid to the vapor phase. This results in an increase in water vapor pressure.
The boiling point is defined as the temperature at which the saturated vapor pressure of a liquid is equal to the surrounding atmospheric pressure. For water, the vapor pressure reaches the standard sea level atmospheric pressure of 760 mmHg at 100°C.
Vapor Pressure of Water from 0 °C to 100 °C. Constant & conversion factors. Atomic parameters (IE, EA, D, ...) Thermodynamic data. Atomic and ionic radii. Lattice thermodynamics.
Another important property of liquids (and solids) that is governed by intermolecular forces is vapor pressure. 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.
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.
Explain the relationship between vapor pressure of water and the capacity of air to hold water vapor. Explain the relationship between relative humidity and partial pressure of water vapor in the air. Calculate vapor density using vapor pressure. Calculate humidity and dew point.
Saturated Vapor Pressure, Density for Water. ... ... Below are some selected values of temperature and the saturated vapor pressures required to place the boiling point at those temperatures.
The graph of the vapor pressure of water versus temperature in Figure \(\PageIndex{3}\) indicates that the vapor pressure of water is 68 kPa at about 90 °C. Thus, at about 90 °C, the vapor pressure of water will equal the atmospheric pressure in Leadville, and water will boil.
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. Examples:
Temperature and pressure play key roles in Global Navigation Satellite System (GNSS) precipitable water vapor (PWV) retrieval. The National Aeronautics and Space Administration (NASA) and European Center for Medium-Range Weather Forecasts (ECMWF) have released their latest reanalysis product: the modern-era retrospective analysis for research and applications, version 2 (MERRA-2) and the fifth ...
Vapor pressure of water (mmHg) Source of data: CRC Handbook of Chemistry and Physics, 84th Edition (2004). S3: Vapor Pressure of Water is shared under a not declared license and was authored, remixed, and/or curated by LibreTexts.
This page looks at how the equilibrium between a liquid (or a solid) and its vapor leads to the idea of a saturated vapor pressure. It also looks at how saturated vapor pressure varies with temperature, and the relationship between saturated vapor pressure and boiling point.