In the study of supersonic flight, Schlieren photography observes the density gradient of air as it interacts with aircraft.
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In the life sciences, a special technique called density gradient separation is used for isolating and purifying cells, viruses and subcellular particles. Variations of this include See more

In the study of population, the density gradient can refer to the change in density in an urban area from the center to the periphery. See more

A steep density gradient in a body of water can have the effect of trapping energy and preventing convection, such a gradient is employed in solar ponds. In the case of salt water, sharp gradients can lead to stratification of different concentrations of salinity See more

The understanding of what is at the centre of the earth, the earth core, requires the framework of density gradients in which elements and compounds then interact. The existence of a See more