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Línea 25:
T_\mathrm{dp}&= \frac{c\gamma(T,\mathrm{RH})}{b-\gamma(T,\mathrm{RH})};\end{align}
</math>
La formulación más completa y el origen de esta aproximación utiliza la [[presión de vapor]] del agua saturada (expresada en milibares, también denominada<osdenominados [[Pascal (unidad)|hectopascales]]) a ''T'', ''P''<sub>s</sub>(''T''),y la presión de vapor actual (tambien en milibares), ''P''<sub>a</sub>(''T''), que se puede obtener con ''RH'' o se puede aproximar con la presión barométrica (en milibares), ''BP''<sub>mbar</sub>, y la temperatura de "[[wet-bulbtemperatura de bulbo temperaturehúmedo|bulbo húmedo]]", ''T''<sub>w</sub> (a menos que se indique lo contrario todas las temperaturas se expresan en grados centígrados):
<math display="block">
\begin{align}
Línea 42:
*''a'' = 6.1121&nbsp;mbar, ''b'' = 18.678, ''c'' = 257.14&nbsp;°C, ''d'' = 234.5&nbsp;°C.
 
Existen varios conjuntos de constantes en uso. TheLos onesutilizados usedpor inla [[NOAA]]'s presentationson<ref>[https://www.weather.gov/media/epz/wxcalc/rhTdFromWetBulb.pdf ''Relative Humidity and Dewpoint Temperature from Temperature and Wet-Bulb Temperature'']</ref> aretomados takende fromun atrabajo de 1980 paper byde David Bolton inen el the ''Monthly Weather Review'':<ref>{{cite journal|last1=Bolton|first1=David|title=The Computation of Equivalent Potential Temperature|journal=Monthly Weather Review|date=July 1980|volume=108|issue=7|pages=1046–1053|doi=10.1175/1520-0493(1980)108<1046:TCOEPT>2.0.CO;2|url=https://www.rsmas.miami.edu/users/pzuidema/Bolton.pdf|bibcode=1980MWRv..108.1046B|access-date=2012-07-04|archive-url=https://web.archive.org/web/20120915053830/http://www.rsmas.miami.edu/users/pzuidema/Bolton.pdf|archive-date=2012-09-15|url-status=dead}}</ref>
*''a'' = 6.112&nbsp;mbar, ''b'' = 17.67, ''c'' = 243.5&nbsp;°C.
TheseEstos valuationsvalores provideproveen a maximumun error ofmáximo de 0.1%, forpara T en el rango {{nowrap|−30 °C ≤ ''T'' ≤ 35°C}} andy humedad relativa {{nowrap|1% < RH < 100%}}.
AlsoTambién noteworthyexiste isun theconjunto de constantes de Sonntag1990,<ref>[http://irtfweb.ifa.hawaii.edu/~tcs3/tcs3/Misc/Dewpoint_Calculation_Humidity_Sensor_E.pdf SHTxx Application Note Dew-point Calculation]</ref>
*''a'' = 6.112&nbsp;mbar, ''b'' = 17.62, ''c'' = 243.12&nbsp;°C; for {{nowrap|−45 °C ≤ ''T'' ≤ 60&nbsp;°C}} (error ±0.35&nbsp;°C).
AnotherOtro commonconjunto setcomún ofde valuesvalores originatesproviene from the 1974de las''Psychrometry and Psychrometric Charts'' publicadas en 1974, aspresentadas presenteden by '''''Paroscientific''''',<ref>{{cite web |url=http://www.paroscientific.com/dewpoint.htm |title=MET4 and MET4A Calculation of Dew Point |access-date=7 October 2014 |url-status=dead |archive-url=https://archive.today/20120526034637/http://www.paroscientific.com/dewpoint.htm |archive-date=May 26, 2012 }}</ref>
*''a'' = 6.105&nbsp;mbar, ''b'' = 17.27, ''c'' = 237.7&nbsp;°C; for {{nowrap|0 °C ≤ ''T'' ≤ 60&nbsp;°C}} (error ±0.4&nbsp;°C).
Also,También inen theel ''Journal of Applied Meteorology and Climatology'',<ref>{{cite journal|last1=Buck|first1=Arden L.|title=New Equations for Computing Vapor Pressure and Enhancement Factor|journal=Journal of Applied Meteorology|date=December 1981|volume=20|issue=12|pages=1527–1532|doi=10.1175/1520-0450(1981)020<1527:NEFCVP>2.0.CO;2|url=http://www.public.iastate.edu/~bkh/teaching/505/arden_buck_sat.pdf|bibcode=1981JApMe..20.1527B|access-date=2016-01-15|archive-date=2016-03-04|archive-url=https://web.archive.org/web/20160304093405/http://www.public.iastate.edu/~bkh/teaching/505/arden_buck_sat.pdf|url-status=dead}}</ref> Arden Buck presents several different valuation sets, with different maximum errors for different temperature ranges. Two particular sets provide a range of −40&nbsp;°C to +50&nbsp;°C between the two, with even lower maximum error within the indicated range than all the sets above:
*''a'' = 6.1121&nbsp;mbar, ''b'' = 17.368, ''c'' = 238.88&nbsp;°C; for {{nowrap|0 °C ≤ ''T'' ≤ 50&nbsp;°C}} (error ≤ 0.05%).
*''a'' = 6.1121&nbsp;mbar, ''b'' = 17.966, ''c'' = 247.15&nbsp;°C; for {{nowrap|−40 °C ≤ ''T'' ≤ 0&nbsp;°C}} (error ≤ 0.06%).