Inatmospheric science,equivalent temperature is thetemperature of air in aparcel from which all thewater vapor has been extracted by anadiabatic process.

Air contains water vapor that has been evaporated into it from liquid sources (lakes, sea, etc...). The energy needed to do that has been taken from the air. Taking a volume of air attemperatureT andmixing ratio ofr, drying it by condensation will restore energy to the airmass. This will depend on thelatent heat release as:$${\displaystyle T_e\approx T+\frac{L_v}{c_{pd}}r}$$where:

• ${\displaystyle L_v}$ :latent heat ofevaporation (2400 kJ/kg at 25°C to 2600 kJ/kg at −40°C)
• ${\displaystyle c_{pd}}$ :specific heat at constant pressure for air (≈ 1004 J/(kg·K))

Tables exist for exact values of the last two coefficients.

• Wet-bulb temperature
• Potential temperature
• Atmospheric thermodynamics
• Equivalent potential temperature

• M Robitzsch,Aequivalenttemperatur und Aequivalentthemometer, Meteorologische Zeitschrift, 1928, pp. 313-315.
• M K Yau and R.R. Rogers,Short Course in Cloud Physics, Third Edition, published by Butterworth-Heinemann, January 1, 1989, 304 pages.ISBN 9780750632157ISBN 0-7506-3215-1
• J.V. Iribarne and W.L. Godson,Atmospheric Thermodynamics, published by D. Reidel Publishing Company,Dordrecht, Holland, 1973, 222 pages

• Atmospheric thermodynamics
• Atmospheric temperature
• Meteorological quantities

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