Equilibrium of a Flat Pure Water Surface with the Atmosphere

1 Equilibrium of a Flat Pure Water Surface with the Atmosphere 

The change of the saturation pressure with temperature can be calculated, as we showed in Chapter 10, by the Clausius-Clapeyron equation  

Replacing in this equation a function describing the temperature dependence of the latent heat of evaporation [e.g., (17.3)], one can integrate and obtain an explicit expression for 

TABLE 17.2 Saturation Vapor Pressure of Water Vapor over a Flat 

FIGURE 15.1 Saturation concentration of water over a flat water surface as a function of temperature. Values below 0 C correspond to supercooled (metastable) water. 

Replacing in the above equation a function describing the temperature dependence of the latent heat of evaporation (e.g., (15.3)), one can integrate and obtain an explicit expression for p°(T). A series of such expressions exist in the literature (see Problem 1.1), and that proposed by Lowe and Ficke (1974) is given in Table 15.2. 

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