why does closing the gas tap a little reduce the size of the flame
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As the flame range depends on the gas tap
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A Bunsen burner, named after Robert Bunsen, is a kind of gas burner used as laboratory equipment; it produces a single open gas flame, and is used for heating, sterilization, and combustion.
A Bunsen burner with needle valve. The hose barb for the gas tube is on the left and the needle valve for gas flow adjustment is on the opposite side. The air inlet on this particular model is adjusted by rotating the barrel, thus opening or closing the vertical baffles at the base.
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