Double-diffusive convection occurs when two properties, such as temperature and composition, affect buoyancy but diffuse at different rates. A stabilizing composition gradient can oppose a destabilizing thermal gradient and change the form of heat transport.
Layered convection consists of mixed convecting layers separated by more weakly transporting interfaces. In a giant planet, composition gradients can support such interfaces and reduce heat loss, contributing to delayed cooling of an inflated giant planet.
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Double diffusive convection is a physical phenomenon that occurs in fluid systems when two different solutes or properties (such as temperature and concentration) are present, leading to buoyancy-driven flow due to the combined effects of thermal and solutal (concentration-related) gradients. This type of convection is particularly relevant in scenarios where light and heavy solutes or varying temperatures influence the fluid's density differently.