Scan_Doc0125 - 5.10 Chemistry in the Atmosphere 217 5.9 ~...

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Table 5.4 Atmospheric Composition Near Sea Level (Dry Air)* Component Mole Fraction N2 O 2 Ar CO 2 Ne He CH 4 Kr H2 NO Xe 0.78084 0.20948 0.00934 0.000345 0.00001818 0.00000524 0.00000168 0.00000114 0.0000005 0.0000005 0.000000087 *The atmosphere contains various amounts of water vapor depending on conditions. 10- 13 1000 500 200 100 ~ 10- 3 ------ --------- 50 ~ ~ ~ ::l 20 "3 ~ 10- 1 - - - -~- - - - .'" £ 10 :;;: OJ 5 ... OJ .c ~ 2 0 0. ~ 1 0 -100 -50 0 50 100 Temperature (0C) Figure 5.30 The variation of temperature (red) and pressure (dashed lines) with altitude. Note that the pressure steadily decreases with altitude, but the temperature increases and decreases. 5.10 Chemistry in the Atmosphere 217 5.9 ~ Characteristics of Several Real Gases We can understand gas behavior more completely if we examine the characteristics of sev- eral common gases. Note from Fig. 5.25 that the gases H2' N 2 , CH 4 , and CO 2 show dif- ferent behavior when the compressibility ( PV) is plotted versus P. For example, notice nRT that the plot for H 2 (g) never drops below the ideal value (1.0) in contrast
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