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Bunsen burner

Bunsen burner
A burner, promoted by Robert Bunsen, used widely in laboratories and sometimes in metal heat-treatment. Through a nozzle at the base is introduced slightly pressurized fuel gas which is mixed with air (primary air) which the flow induces through adjustable inlets. The usual gas:air ratio is 1:2. The mixture proceeds up a metal tube, about 13cm (5in) high, and is ignited at the top, giving a flame temperature of 2,000 K. Outer portions of the flame mix with further air (secondary air) to give a cooler, more luminous flame, where the gas:air ratio is about 1:4.

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