From dew points

Table 11.4 Solutions for Maintaining Constant Humidity Table 11.5 Concentration of Solutions of H2SO4, NaOH, and CaCi2 Giving Specified Vapor Pressures and Percent Humidities at 25°C Table 11.6 Relative Humidity from Wet and Dry Bulb Thermometer Readings Table 11.7 Relative Humidity from Dew Point Readings...

TABLE 11.7 Relative Humidity from Dew Point Readings... 

The vapour pressures obtained from dew point measurements will depend on the relationship used for the temperature dependence of the saturated vapour pressure. A number of relationships, = f (7), have been proposed for the equilibrium Se02(cr) Se02(g), see Section V.2.2.3. in Chapter V. In order to obtain consistency it is necessary to revise previous vapour pressures calculated from the dew point temperature, to conform with the accepted = f (7 ) function. The problem met in this revision has been the fact that in some instances only p values have been published, while the dew point temperatures and the relationship used to obtain are absent. 

If only LNKs are present, we should step off stages going down the column. Then the liquid mole fractions are determined from dew-point calculations and the vapor mole fractions are found from the operating equations. Otherwise, the procedure is very similar to going down the column with constant relative volatilities. 

In 2007 (O Fig. 20.43c), the gas-flow rate was increased to 1,500 ml/min in order to increase the transport efficiency. The temperature gradient was between +32°C and — 164°C. As a result, the Hg deposition region broadened considerably to 14 detectors. Only about 30% of the Rn deposited on the last four detectors. The faster carrier gas transported three observed atoms of Cn further down to detectors at lower temperatures. Chains 3 and 5 were detected in detectors 11 (—21°C) and 14(—39°C). Chain 4 was detected in detector 26 (—124°C). From dew point measurements in the carrier gas, it has to be concluded that the detector surfaces held below — 95° C were covered by a thin ice layer (O Fig. 20.43a-c, vertical lines). Thus, it was concluded that four events (chains 1-3, and 5) are attributable to atoms of element 112 deposited on the gold surface, while chain 4 represents an atom of element 112 deposited on ice. 

Depression of the freezing point, 8-52 to 77, 15-28,15-29 Derivatives, A-9 to 11 Detectors, infrared, 10-245 Determination of Relative Humidity from Dew Point, 15-31... 

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