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||The same conditions and the composition of the air conditioned the unchanging, and begins reign Molecular diffusion - geterosfera. The transition region (105 - 110 km) usually turbopause called. Above turbopause friendship between atmospheric gases violated. Now everyone is living on his own. And more easily move upward, and the heavier behind. In other words, the higher we rise in geterosfere, the greater the proportion of light particles (such as H and He) compared with heavy (eg, O2 and N2). We present here a simple formula, which is important for understanding many issues discussed below. Particle concentration [X] h of the class X (say, atoms On or molecules N2) at a certain height h related to the concentration of the same species [X] on to different height h0, which can be regarded as a conditional origin. In geterosfere effective law: the easier, the more. For the denominator of (2) is molecular weight of the gas M M. The more, the smaller H. A smaller H, the decreases rapidly with height of the concentration of this gas. Suppose, for example, the height of the homogeneous environment for molecular nitrogen (M = 28) at turbopause (say, 110 km) is 8 km. For helium (M = 4), whereas it is 56 km away. Hence, in the transition from 110 to 166 km the absolute concentration of helium drops of e. But the concentration of N2 in the same height range have time to fall in e7 time since the rise for every 8 km mean less [N2] 2.7 times. Thus, the concentration of helium in relation to molecular nitrogen to grow from a height of 110 to 166 km in altitude e6 ≈ 400 times! That's what independent distribution law particles, or the so-called diffusion separation. We call attention to one thing. In formula (2) in the numerator temperature. So, the higher the T, the more H and thus the slower (on the scale Heights) there is a drop in concentration, and hence the diffusion separation light and heavy gases. What temperature is lower, so all of these effects are more pronounced. To what heights will also have the formula (1)? So, where the particles of the atmosphere is have enough collisions to exchange kinetic energy.