The connection is also made to convection in our atmosphere, and convection in the Sun.
Convection is one such process.
A heated fluid will rise to the top of a column, radiate heat away, and then fall to be reheated, etc. Gases, like our atmosphere, are fluids too. A packet of fluid can become trapped in this cycle. When it does, it becomes part of a convection cell. Convection also occurs on the Sun.