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  2. Vapour-pressure deficit - Wikipedia

    en.wikipedia.org/wiki/Vapour-pressure_deficit

    Global distribution of Vapour-pressure deficit averaged over the years 1981-2010 from the CHELSA-BIOCLIM+ data set [1] Vapour pressure-deficit, or VPD, is the difference (deficit) between the amount of moisture in the air and how much moisture the air can hold when it is saturated. Once air becomes saturated, water will condense to form clouds ...

  3. Vapor pressure - Wikipedia

    en.wikipedia.org/wiki/Vapor_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. [7] At the normal boiling point of a liquid, the vapor pressure is equal to the standard atmospheric pressure defined as 1 atmosphere, [1] 760 Torr, 101.325 kPa, or 14.69595 psi.

  4. Potential evapotranspiration - Wikipedia

    en.wikipedia.org/wiki/Potential_evapotranspiration

    δe = vapor pressure deficit (kPa) γ = Psychrometric constant (γ ≈ 66 Pa K −1) N.B.: The coefficients 0.408 and 900 are not unitless but account for the conversion from energy values to equivalent water depths: radiation [mm day −1] = 0.408 radiation [MJ m −2 day −1].

  5. Vapor pressure deficit - Wikipedia

    en.wikipedia.org/?title=Vapor_pressure_deficit&...

    From Wikipedia, the free encyclopedia. Redirect page. Redirect to: Vapour-pressure deficit ...

  6. Canopy conductance - Wikipedia

    en.wikipedia.org/wiki/Canopy_conductance

    Canopy conductance, commonly denoted , is a dimensionless quantity characterizing radiation distribution in tree canopy.By definition, it is calculated as a ratio of daily water use to daily mean vapor pressure deficit (VPD). [1]

  7. Vapor pressures of the elements (data page) - Wikipedia

    en.wikipedia.org/wiki/Vapor_pressures_of_the...

    Values are given in terms of temperature necessary to reach the specified pressure. Valid results within the quoted ranges from most equations are included in the table for comparison. A conversion factor is included into the original first coefficients of the equations to provide the pressure in pascals (CR2: 5.006, SMI: -0.875).

  8. Vapour pressure of water - Wikipedia

    en.wikipedia.org/wiki/Vapour_pressure_of_water

    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 .

  9. Vapor pressure osmometry - Wikipedia

    en.wikipedia.org/wiki/Vapor_pressure_osmometry

    In polymer chemistry, vapor phase osmometry (VPO), also known as vapor-pressure osmometry, is an experimental technique for the determination of a polymer's number average molecular weight, M n. It works by taking advantage of the decrease in vapor pressure that occurs when solutes are added to pure solvent .