Escape and Stand of the Pluto Atmosphere

Molar mass of the lightest gas, which will exist "forever" in the atmosphere at the planet surface, can be evaluated by Jeans rule. The of Pluto is 17.3 g · mol −1 . It is evident that both N 2 and CO can be major atmospheric composition at the Pluto surface, and will exist "forever". CH 4 can only be escaping slowly from Pluto atmosphere, and still holds quite a proportion in current Pluto atmosphere. However, it will not escape from Titan (or Jupiter, Saturn) atmosphere largely, and will exist "forever". Given the quantity level of partial pressure of CH 4 in Pluto and Titan (or Jupiter, Saturn) original atmosphere is the same, it will be clear that the current partial pressure of CH 4 in Pluto surface atmosphere is 10 −3 Pa.