The state or condition of an atmosphere or ocean where pressure depends only on density, creating a barotropic environment.
From Greek 'baros' (pressure) + 'tropos' (turning). This atmospheric science term emerged in 20th-century meteorology to describe simplified pressure-density relationships.
Perfect barotropy is rare in the real atmosphere—it's more like the ideal gas that physics professors love because it makes equations solvable, but nature prefers the messier baroclinic reality where pressure and density don't align so neatly.
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