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  2. Dew point - Wikipedia

    en.wikipedia.org/wiki/Dew_point

    The dew point temperature equals the air temperature when the air is saturated with water; in all other cases the dew point will be less than the air temperature. [ 6 ] : 129 In technical terms, the dew point is the temperature at which the water vapor in a sample of air at constant barometric pressure condenses into liquid water at the same ...

  3. Water activity - Wikipedia

    en.wikipedia.org/wiki/Water_activity

    In food science, water activity (a w) of a food is the ratio of its vapor pressure to the vapor pressure of water at the same temperature, both taken at equilibrium. [1] Pure water has a water activity of one. Put another way, a w is the equilibrium relative humidity (ERH) expressed as a fraction instead of as a percentage.

  4. Useful conversions and formulas for air dispersion modeling

    en.wikipedia.org/wiki/Useful_conversions_and...

    As an example, given a concentration of 260 mg/m 3 at sea level, calculate the equivalent concentration at an altitude of 1,800 meters: C a = 260 × 0.9877 18 = 208 mg/m 3 at 1,800 meters altitude Standard conditions for gas volumes

  5. Psychrometrics - Wikipedia

    en.wikipedia.org/wiki/Psychrometrics

    Xchanger Inc, webpage Calculator for humidity, dew point, mass flows & heat flux for variable pressure systems with compressors, blowers, vacuum pumps and heat exchangers. Corwin's Calculators Calculator for humidity, dew point. How to read and use a psychrometric chart; Free Online Interactive Psychrometric Chart

  6. Tetens equation - Wikipedia

    en.wikipedia.org/wiki/Tetens_equation

    The Tetens equation is an equation to calculate the saturation vapour pressure of water over liquid and ice. It is named after its creator, O. Tetens who was an early ...

  7. Goff–Gratch equation - Wikipedia

    en.wikipedia.org/wiki/Goff–Gratch_equation

    The Goff–Gratch equation is one (arguably the first reliable in history) amongst many experimental correlation proposed to estimate the saturation water vapor pressure at a given temperature. Another similar equation based on more recent data is the Arden Buck equation .

  8. Bubble point - Wikipedia

    en.wikipedia.org/wiki/Bubble_point

    In thermodynamics, the bubble point is the temperature (at a given pressure) where the first bubble of vapor is formed when heating a liquid consisting of two or more components. [ 1 ] [ 2 ] Given that vapor will probably have a different composition than the liquid, the bubble point (along with the dew point ) at different compositions are ...

  9. Talk:Dew point - Wikipedia

    en.wikipedia.org/wiki/Talk:Dew_point

    In the 1981 Buck paper he gives the equation for calculating dew point with the additional d constant as: T d = (d/2) * [b - γ - ((b - γ) 2 - 4*c*γ/d) 1/2]. I stumbled across this because I wrote some code to convert back and forth between RH and dew point, and I found I was getting different answers depending on which direction the ...