A measure of the stratification in a fluid, baroclinity is proportional to <math>\nabla p \times \nabla \rho</math>, which again is proportional to the angle between surfaces of constant pressure and surfaces of constant density. Thus in a barotropic fluid (which is defined by zero baroclinity), these surfaces are parallel.
Areas of high atmospheric baroclinity are characterized by the frequent formation of cyclones.
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... death of his grandfather Ferdinand in 1516, Charles became joint-king of Castile with his mother (who was insane), and also inherited Aragon, Navarre, Granada, Naples, ...