Convection oven sweet potato cubes

On this Wikipedia the language links are at the convection oven sweet potato cubes of the page across from the article title. This article is about the method of heat transfer.

For fluid flow driven by heterogeneous fluid properties and body forces, see Convection. Simulation of thermal convection in the Earth’s mantle. Hot areas are shown in red, cold areas are shown in blue. A hot, less-dense material at the bottom moves upwards, and likewise, cold material from the top moves downwards. Note that this definition of convection is only applicable in Heat transfer and thermodynamic contexts. Thermal expansion of fluids may also force convection.

In other cases, natural buoyancy forces alone are entirely responsible for fluid motion when the fluid is heated, and this process is called “natural convection”. An example is the draft in a chimney or around any fire. The convection heat transfer mode comprises one mechanism. This motion is associated with the fact that, at any instant, large numbers of molecules are moving collectively or as aggregates. In the absence of an internal source, when the fluid is in contact with a hot surface, its molecules separate and scatter, causing the fluid to be less dense.