sigma function


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sigma function

[′sig·mə ‚fəŋk·shən]
(thermodynamics)
A property of a mixture of air and water vapor, equal to the difference between the enthalpy and the product of the specific humidity and the enthalpy of water (liquid) at the thermodynamic wet-bulb temperature; it is constant for constant barometric pressure and thermodynamic wet-bulb temperature.
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The identity (21) is often written in terms of the Weierstrass elliptic and sigma functions as [7, p.451],
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