Convection heat is the transfer of heat from the
heater to surrounding
air by the natural circulation of
air through the
heater. In free or natural convection, the
air motion is a result of gravitational forces where the heated
air is lighter than the cooler
air. The heated
air rises from the top of the
heater and is replaced by cooler
air which enters from the bottom. This
air current delivers the heat to the surrounding room. Individual convection
heaters are a common heat source in small
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