Convection
heat transfer due to the bulk movement of molecules within fluids / From Wikipedia, the free encyclopedia
Convection is the movement of heat due to the movement of warm matter. Convection is defined as the method of heat transfer through a liquid or solid from places of higher temperature to lower temperature based on the movement of the molecules, because of the different densities.
For example, atmospheric circulation moves warm air to cool places, causing wind. Wind, in turn, can enter and cool a room if the window is open. The movement of the clouds, the ocean currents and many types of heaters are examples of convection.