what separates the layers of the atmosphere?

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I was watching the layers of rhe atnosphere in a google search and it says that there are different layers, but I really don’t understand that separates them. It is the gravity of the earth that creates such phenomenon?

In: Physics

Really, there are no “layers” in the atmosphere, not in the physical sense. There’s the ozone layer, sure, but in terms of the troposphere, stratosphere, etc, it’s a fairly smooth gradient in terms of pressure and atmospheric density — yes, caused by gravity. The names are mostly for human convenience.

Temperature gravity windsheer all effect the layers, however there isn’t a sharp boundary between each layer more a gradual transition.

The “borders” between the layers are extremely fuzzy, but it’s basically the same effect as oil floating on water – the lighter elements exist in heigher concentrations in the upper layers.