Water Vapor Pressure Chart
Water Vapor Pressure Chart. The vapour 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). In a mixture of ideal gases, each gas has a partial pressure which is the pressure which the gas would have if it alone occupied the volume.
The left side of the chart is the temperature of the air in and around the canopy of the plants. Temperature: Pressure: Temperature: Pressure (degrees C) (mmHg) (degrees C) (mmHg) The vapor pressure of a liquid is defined as the pressure exerted by the molecules that escapes from the liquid to form a separate vapor phase above the liquid surface. The saturation vapour pressure is the pressure at which water vapour is in thermodynamic equilibrium with its condensed state.
The pressures are stated in mega-Pascals, where a Pascal is a Newton per square meter, and as a multiple of standard atmospheric pressure.
This is illustrated in the vapor pressure chart (see right) that shows graphs of the vapor pressures versus temperatures for a variety of liquids.
One of the most referenced set of data in lyophilization is the vapor pressure of ice chart. As a general trend, vapor pressures of liquids at ambient temperatures increase with decreasing boiling points. The pressure exerted by the vapor phase is called the. vapor or saturation pressure.
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Ronald Farrel
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