We were taught is school that we are breathing in molecules from Caesar’s last breath, if this is true it should hold true for every person that ever lived, is our atmosphere really that fluid?
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Well, every breath contains quintillions of molecules. The whole atmosphere has… I don’t even know, uncountably many molecules. Surely a couple of those quintillions of molecules in your breath will be blown somewhere far away. And then blown back later.
Yes, the atmosphere *is* that fluid, in the sense that the whole atmosphere acts as one big “pool”, it’s not really divided up into “pockets” anywhere, where “barriers” prevent air from traveling. Like in the broad scale yes, mountain ranges can block air fronts, but it’s not like they block *every single* molecule. And air molecules are very high-energy since they’re in a gaseous form. That means they move around a lot, just as a feature of their existence. Molecules in a liquid or solid form might stay put a little more often, but air molecules are flying everywhere in every direction all the time. Gas expands to fill the entirety of the container it’s in. Air goes up hundreds of miles into the sky, getting thinner and thinner yes but it’s only when you get to like thousands of miles up that the Earth’s gravity has basically prevented any significant number of air molecules from reaching.
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