does is connect the Bunsen burner to a source of fuel. It produces two types of flames depending on whether the air hole is open and the amount of air entering the barrel. With a mostly closed air hole, a luminous flame appears. This flame is yellow and wavy. Also, as the faster-moving molecules escape, the remaining molecules have lower average kinetic energy, and the temperature of the liquid thus decreases. Evaporation therefore, proceeds more quickly at higher temperature, at higher flow
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