The flames are not used in experiments (not best for laboratory operations) because it is wavy and sooty in nature.The burning gas has limited access to oxygen.The flames are wavy and brightly visible.Luminous flames do not get enough oxygen to turn all the carbon that is being burnt into carbon dioxide. The flames do not burn more efficiently.Flames are not steady (do not burn steadily).They are not very hot (produce less heat).In a Bunsen burner, luminous flame is formed when the air-hole is completely closed.Blue region on the sides of region of un-burnt gas where there is complete burning.The region of un-burnt gas below the yellow region where the gas does not burn.The top yellow region where there is incomplete combustion/burning.When a strike back occurs, turn on the gas tap immediately. The collar will be hot and a loud sound will be heard. A green flame is seen at the top of the barrel as the gas burns at the jet. Then, instead of burning at the top of the barrel, the gas burns at the jet. It generally occurs when there is little gas and too much air entering the air-hole (air-hole is wide opened). With too much air, the gas mixture will burn completely producing a pale-blue flame, which is referred to as non-luminous.Ī strike-back may occur sometimes when you use a Bunsen burner. With too little air, the gas mixture will not burn completely and will form tiny carbon particles that are heated to glowing, making the flame luminous. It burns with a pale blue flame, the primary flame, seen as a small inner cone, and a secondary, almost colorless flame, seen as a larger, outer cone, which results when the remaining gas is completely oxidized by the surrounding air. The mixture of air and gas (optimally about 1 part gas to 3 parts air) is forced by gas pressure to the top of the tube, where it is ignited with a match. The Bunsen burner consists of a metal tube on a base with a gas inlet at the lower end of the tube, which may have an adjusting valve openings in the sides of the tube can be regulated by a collar to admit as much air as desired.
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