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- Arden Buck equation
- Goff–Gratch equation
- Antoine equation
- Tetens equation
- Dew point
- Humidity
- Lee–Kesler method
- Wood drying
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The Arden Buck equations are a group of empirical correlations that relate the saturation vapor pressure to temperature for moist air. The curve fits have been optimized for more accuracy than the Goff–Gratch equation in the range −80 to 50 °C (−112 to 122 °F).
A set of several equations were developed, each of which is applicable in a different situation.
Formula
The equations suggested by Buck (1996) (which are modifications of the equations in Buck (1981)) are:
P
s
(
T
)
=
6.1121
exp
(
(
18.678
−
T
234.5
)
(
T
257.14
+
T
)
)
{\displaystyle P_{\mathrm {s} }\left(T\right)=6.1121\exp \left(\left(18.678-{\frac {T}{234.5}}\right)\left({\frac {T}{257.14+T}}\right)\right)}
, over liquid water, T > 0 °C
P
s
(
T
)
=
6.1115
exp
(
(
23.036
−
T
333.7
)
(
T
279.82
+
T
)
)
{\displaystyle P_{\mathrm {s} }\left(T\right)=6.1115\exp \left(\left(23.036-{\frac {T}{333.7}}\right)\left({\frac {T}{279.82+T}}\right)\right)}
, over ice, T < 0 °C
where:
Ps(T) is the saturation vapor pressure in kPa
exp(x) is the exponential function
T is the air temperature in degrees Celsius
Buck (1981) also lists enhancement factors for a temperature range of −80 to 50 °C (−112 to 122 °F) at pressures of 1,000 mb, 500 mb, and 250 mb. These coefficients are listed in the table below.
See also
Vapour pressure of water
Antoine equation
Tetens equation
Lee–Kesler method
Goff–Gratch equation
Notes
References
Buck, A. L. (1981), "New equations for computing vapor pressure and enhancement factor", J. Appl. Meteorol., 20 (12): 1527–1532, Bibcode:1981JApMe..20.1527B, doi:10.1175/1520-0450(1981)020<1527:NEFCVP>2.0.CO;2
Buck (1996), Buck (1996), Buck Research CR-1A User's Manual, Appendix 1.. (PDF)
External links
Web Page listing various vapor pressure equations (for below 0 °C)
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