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Pressure equals force per unit area. Seems like a
surface is an necessity.
... that each air molecule collides with one or another of its
neighbors 10,000,000,000 times per second. How is something like this
determined?
Would unconfined helium rise just as well as confined helium?
> At ordinary temperatures, you would need a
>container many miles high in order to see
>much fractionation of the atmosphere. (And
>you would need to suppress convection, etc.)
Doesn't this last statement conflict with the previous idea that the less
massive H2O rises to the ceiling of a room (much less than many miles
high).