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# Scan_Doc0120 - 212 Chapter Five Gases Figure 5.l.9 Path of...

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212 Chapter Five Gases Figure 5.l.9 Path of one particle in a gas. Any given particle will continuously change its course as a result of collisions with other particles, as well as with the walls of the container. '" <1) ;::; ~ ~ ON 4-<;>, 0_ '-< '(3 <1) 0 .D - E ~ ;:l " " <1) <1) :> :> .- ]; ~ .~ o 4 X 10 2 8 X 10 2 Molecular velocity (m/s) Figure 5.20 A plot of the relative number of O 2 mole- cules that have a given velocity at STP. '" <1) "3 o <1) ~ Z 4-<;>, o .!:: '-< u <1) 0 .D - E ~ ;:l " " <1) <1) :> .e 'So 'OJ-= ~ .~ 0:: '" 273K o 1000 2000 Velocity (m/s) 3000 Figure 5.2l. A plot of the relative number of N2mole- cules that have a given velocity at three temperatures. Note that as the tempera- ture increases, both the average velocity and the spread of velocities increase. If the path of a particular gas particle could be monitored, it would look very erratic, something like that shown in Fig. 5.19. The average distance a particle travels between collisions in a particular gas sample is called the mean free path. It is typically avery small distance (1 X 10- 7 m for O 2 at STP). One effect of the many collisions among gas
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