Look up "Jeans Escape."
Thermal losses from the edge of the atmosphere, i.e. molecules reaching escape velocity from thermal effects, are calculated at about three kilograms of hydrogen and 50 grams of helium per second.
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Thermal losses from the edge of the atmosphere, i.e. molecules reaching escape velocity from thermal effects, are calculated at about three kilograms of hydrogen and 50 grams of helium per second.