Light a gas burner .open and close the air hole at the bottom of the burner by means of the movable rings around it . When do u get a yellow sooty flame ? When do u get a blue flame ?
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we get a sooty flame when the gas is not burned properly or when there are unburnt Ca particles present in the flame.
we get blue flame when these airholes are opened/cleaned so that the gas is burnt completely
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