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 unlets.
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 ration is
about 1 : 4.
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