Convection cooling

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Convection cooling

Convection cooling is passive cooling without forced ventilation by mechanical fans. Heat flow is based on natural convection (the entrainment of thermal energy in a flowing medium). Heated air particles have a lower density, rise in the power supply unit and thus cause air movement.
Convection (or heat flow or heat transfer) is one of the three mechanisms for heat transfer of energy, along with heat conduction and heat radiation.