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A Bunsen burner is a kind of gas burner frequently used together a heat source in laboratory experiments. The burner consists of a level base with a directly tube expanding vertically, well-known as the barrel or chimney. Herbal gas (predominantly methane) or a liquified petroleum gas such as propane or butane is gave at the bottom the the chimney.

You are watching: What is the function of a bunsen burner

Bunsen burners are normally fitted v a hose barb in ~ the basic of the chimney to enable rubber tube to it is provided the gas from a gas nozzle top top the laboratory bench. There may additionally be a gas value on the Bunsen burner. The other an essential component the a Bunsen burner is the wait hole. This is situated near the bottom the the chimney, just above the gas inlet. The waiting hole allows pre-mixing that air and also gas before combustion wake up at the peak of the chimney. A collar roughly the base of the chimney, with a hole that aligns with the air hole, acts together an air regulator, enabling the wait in the pre-mixture to it is in adjusted.

Air is attracted into the wait hole because of the Venturi effect. A fluid circulation transfers power in 3 ways, potential energy, pressure and kinetic energy. Bernoulli’s principle states that, due to conservation the energy, a change in velocity must result in either a readjust in the potential energy or a change in the fluid’s pressure. Once a fluid circulation increases in velocity, generally it is the pressure which decreases. Because the gas in a Bunsen burner is flowing through the chimney, it has a reduced pressure than the revolution air surrounding it. This difference in pressure causes air come be attracted into the waiting hole as the gas flows previous it, a phenomenon known as the Venturi effect.

As the air feet is opened the fire progresses indigenous an unsteady orange flame to a an ext steady orange, a steady purple and also finally a roaring blue flame. This development results in boosting flame temperature. The unstable orange flame created when the air feet is totally closed is extremely visible and of lower temperature. This safety flame is, therefore, used for lighting and also as the default position once the Bunsen burner is no in use.


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