holypony idk what this means

[atomic7732]

If the assumption is made that the atmosphere is divergence-free, the curl of the Euler equations reduces into the barotropic vorticity equation. This latter equation can be solved over a single layer of the atmosphere. Since the atmosphere at a height of approximately 5.5 kilometres (3.4 mi) is mostly divergence-free, the barotropic model best approximates the state of the atmosphere at a geopotential height corresponding to that altitude, which corresponds to the atmosphere's 500 mb (15 inHg) pressure surface.

http://en.wikipedia.org/wiki/Barotropic_vorticity_equation

http://tutorial.math.lamar.edu/Classes/DE/DE.aspx

[tuto99]

If the assumption is made that the atmosphere is divergence-free, the curl of the Euler equations reduces into the barotropic vorticity equation. This latter equation can be solved over a single layer of the atmosphere. Since the atmosphere at a height of approximately 5.5 kilometres (3.4 mi) is mostly divergence-free, the barotropic model best approximates the state of the atmosphere at a geopotential height corresponding to that altitude, which corresponds to the atmosphere's 500 mb (15 inHg) pressure surface.

http://en.wikipedia.org/wiki/Barotropic_vorticity_equation

http://tutorial.math.lamar.edu/Classes/DE/DE.aspx

First of all, where, how, and/ or why do you find information of this sort in general? XD
Second, you're not the only one who's confused.

[FiahOwl]

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[tuto99]

I can tell you what it means, but first I need a cupcake.

Seriously, I know.

*Tuto hands FiahOwl a fluffy cupcake*
Now explain in your own words what it means without using the above links.

[FiahOwl]

This message is only viewable with Universe Sandbox Galaxy Edition. Access it and much more with promo-code '99733'.

[tuto99]

Well, if the assumption is made that the atmosphere is divergence-free, the curl of the Euler equations reduces into the barotropic vorticity equation. This latter equation can be solved over a single layer of the atmosphere. Since the atmosphere at a height of approximately 5.5 kilometres (3.4 mi) is mostly divergence-free, the barotropic model best approximates the state of the atmosphere at a geopotential height corresponding to that altitude, which corresponds to the atmosphere's 500 mb (15 inHg) pressure surface.

Lol, I knew you wouldn't know what it meant.

[blotz]

to many chars i'm not reading

[atomic7732]

khan academy to the rescue