2.5 2.69 x 1025 molecules m-3.
2.7 Differentiate P(v) with respect to v and set it to zero. See Table 2.2.
2.9 630 Pa. 1 kg m-1. Pressure with moisture = 78646 Pa. Density of moist mix = 1 kg m-3. Density of dry air at same temperature and pressure: 1.003 kg m-3.
2.12 n0 = 2.69 x 1025 molecules m-3, H = 8000m, N = 2.15x1029 molecules.
2.16 /yeiiow = c/X = 6.0 x 1014s-1. /con = n0acv ~ 6.5 x 109s-1. An excited atom might suffer tens of collisions before it relaxes to the lower energy level.
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