@Windy_Skies Endosmose (here in French language) is related to the density of the fluids. The archaic form of endosmosis is none other than the initial term in French, “endosmose” (or “osmose”), for a phenomenon described by Henri Dultrochet
The English translation of some passages is:
“The endosmosis or osmosis discovered by Henri Dutrochet describes the way in which two fluids of different density conduct themselves which are only separated by a porous and breathable membrane.”
“The velocities with which two gases pass through a weak orifice of a membrane, are in inverse proportion to the square root of their density.”
endosmose of which I provided the link for the book from 1840 describes the same phenomenon (but without precise details), and has nothing to do with pressure as such, whether in its archaic form or not.
No. As I report the explanations above, it is an affair of density, not pressure.
But from the first post:
This is not the same as “just using a hydrogen balloon” which would be off-topic in regard to the content of your initial post. So a discussion about “just using a hydrogen balloon” would require another topic.