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Dissipation of Planetary Atmospheres

V. A. Firsoff
Science
New Series, Vol. 130, No. 3385 (Nov. 13, 1959), pp. 1337-1338
Stable URL: http://www.jstor.org/stable/1756870
Page Count: 2
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Abstract

Escape-level density is approximately inversely proportional to gravity and with decreasing mass will tend toward that of interplanetary gas. When this value is reached, dissipation must cease. The minimum possible ground density of lunar air is calculated to be $10^{-12}$ that of the air at normal temperature and pressure. Ionization creates a binding electrostatic charge at the escape level.

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