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The city of Heidelberg had begun to install coal-gas street lighting, and so the university laid gas lines to the new laboratory.

The designers of the building intended to use the gas not just for illumination, but also in burners for laboratory operations.

For any burner lamp, it was desirable to maximize the temperature and minimize luminosity. However, existing laboratory burner lamps left much to be desired not just in terms of the heat of the flame, but also regarding economy and simplicity.

While the building was still under construction in late , Bunsen suggested certain design principles to the university's mechanic, Peter Desaga , and asked him to construct a prototype.

Similar principles had been used in an earlier burner design by Michael Faraday , as well as in a device patented in by the gas engineer R.

Desaga created adjustable slits for air at the bottom of the cylindrical burner, with the flame igniting at the top.

By the time the building opened early in , Desaga had made 50 burners for Bunsen's students. Two years later Bunsen published a description, and many of his colleagues soon adopted the design.

Bunsen burners are now used in laboratories all around the world. The device in use today safely burns a continuous stream of a flammable gas such as natural gas which is principally methane or a liquefied petroleum gas such as propane , butane , or a mixture of both.

The hose barb is connected to a gas nozzle on the laboratory bench with rubber tubing. Most laboratory benches are equipped with multiple gas nozzles connected to a central gas source, as well as vacuum, nitrogen , and steam nozzles.

The gas then flows up through the base through a small hole at the bottom of the barrel and is directed upward. There are open slots in the side of the tube bottom to admit air into the stream using the Venturi effect , and the gas burns at the top of the tube once ignited by a flame or spark.

The most common methods of lighting the burner are using a match or a spark lighter. The amount of air mixed with the gas stream affects the completeness of the combustion reaction.

Less air yields an incomplete and thus cooler reaction, while a gas stream well mixed with air provides oxygen in a stoichiometric amount and thus a complete and hotter reaction.

The air flow can be controlled by opening or closing the slot openings at the base of the barrel, similar in function to the choke in a carburettor.

If the collar at the bottom of the tube is adjusted so more air can mix with the gas before combustion, the flame will burn hotter, appearing blue as a result.

If the holes are closed, the gas will only mix with ambient air at the point of combustion, that is, only after it has exited the tube at the top.

This reduced mixing produces an incomplete reaction, producing a cooler but brighter yellow, which is often called the "safety flame" or " luminous flame ".

The yellow flame is luminous due to small soot particles in the flame, which are heated to incandescence. The yellow flame is considered "dirty" because it leaves a layer of carbon on whatever it is heating.

When the burner is regulated to produce a hot, blue flame, it can be nearly invisible against some backgrounds. The hottest part of the flame is the tip of the inner flame, while the coolest is the whole inner flame.

Increasing the amount of fuel gas flow through the tube by opening the needle valve will increase the size of the flame. However, unless the airflow is adjusted as well, the flame temperature will decrease because an increased amount of gas is now mixed with the same amount of air, starving the flame of oxygen.

Generally, the burner is placed underneath a laboratory tripod , which supports a beaker or other container. The burner will often be placed on a suitable heatproof mat to protect the laboratory bench surface.

A Bunsen burner is also used in microbiology laboratories to sterilise pieces of equipment [7] and to produce an updraft that forces airborne contaminants away from the working area.

Other burners based on the same principle exist. The most important alternatives to the Bunsen burner are:.

From Wikipedia, the free encyclopedia. Bunsen burner 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.

Bibcode : JChEd.. He investigated emission spectra of heated elements, and discovered caesium in and rubidium in with the physicist Gustav Kirchhoff.

Bunsen also developed several gas-analytical methods, was a pioneer in photochemistry , and did early work in the field of organoarsenic chemistry.

With his laboratory assistant Peter Desaga , he developed the Bunsen burner , an improvement on the laboratory burners then in use.

Bunsen was the youngest of four sons of the University of Göttingen 's chief librarian and professor of modern philology, Christian Bunsen — After attending school in Holzminden , Bunsen matriculated at Göttingen in and studied chemistry with Friedrich Stromeyer as well as mineralogy with Johann Friedrich Ludwig Hausmann and mathematics with Carl Friedrich Gauss.

During his journeys, Bunsen met the scientists Friedlieb Runge who discovered aniline and in isolated caffeine , Justus von Liebig in Giessen , and Eilhard Mitscherlich in Bonn.

In Bunsen became a lecturer at Göttingen and began experimental studies of the in solubility of metal salts of arsenous acid.

His discovery of the use of iron oxide hydrate as a precipitating agent is still today the most effective antidote against arsenic poisoning. This interdisciplinary research was carried on and published in conjunction with the physician Arnold Adolph Berthold.

Bunsen taught there for three years, and then accepted an associate professorship at the University of Marburg , where he continued his studies on cacodyl derivatives.

He was promoted to full professorship in While at University of Marburg, Bunsen participated in the expedition for the investigation of Iceland's volcanoes.

Bunsen's work brought him quick and wide acclaim, partly because cacodyl, which is extremely toxic and undergoes spontaneous combustion in dry air, is so difficult to work with.

Bunsen almost died from arsenic poisoning , and an explosion with cacodyl cost him sight in his right eye. In , [15] Bunsen created the Bunsen cell battery, using a carbon electrode instead of the expensive platinum electrode used in William Robert Grove 's electrochemical cell.

Early in he accepted a professorship at the University of Breslau , where he taught for three semesters. There he used electrolysis to produce pure metals , such as chromium , magnesium , aluminium , manganese , sodium , barium , calcium and lithium.

A long collaboration with Henry Enfield Roscoe began in , in which they studied the photochemical formation of hydrogen chloride HCl from hydrogen and chlorine.

From this work, the reciprocity law of Bunsen and Roscoe originated. He discontinued his work with Roscoe in and joined Gustav Kirchhoff to study emission spectra of heated elements, a research area called spectrum analysis.

For this work, Bunsen and his laboratory assistant, Peter Desaga , had perfected a special gas burner by , which was influenced by earlier models.

The newer design of Bunsen and Desaga, which provided a very hot and clean flame, is now called simply the " Bunsen burner ", a common laboratory equipment.

There had been earlier studies of the characteristic colors of heated elements, but nothing systematic. In the summer of , Kirchhoff suggested to Bunsen that he should try to form prismatic spectra of these colors.

By October of that year the two scientists had invented an appropriate instrument, a prototype spectroscope. Using it, they were able to identify the characteristic spectra of sodium, lithium, and potassium.

After numerous laborious purifications, Bunsen proved that highly pure samples gave unique spectra. In the course of this work, Bunsen detected previously unknown new blue spectral emission lines in samples of mineral water from Dürkheim.

He guessed that these lines indicated the existence of an undiscovered chemical element. He named the element "caesium", after the Latin word for deep blue.

The following year he discovered rubidium, by a similar process. In , Robert Bunsen together with Gustav Robert Kirchhoff were the first recipients of the prestigious Davy Medal "for their researches and discoveries in spectrum analysis".

Bunsen was one of the most universally admired scientists of his generation. He was a master teacher, devoted to his students, and they were equally devoted to him.

At a time of vigorous and often caustic scientific debates, Bunsen always conducted himself as a perfect gentleman, maintaining his distance from theoretical disputes.

He much preferred to work quietly in his laboratory, continuing to enrich his science with useful discoveries.

As a matter of principle he never took out a patent. He never married. Despite his lack of pretension, Bunsen was a vivid "chemical character", had a well-developed sense of humor, and is the subject of many amusing anecdotes.

When Bunsen retired at the age of 78, he shifted his work solely to geology and mineralogy , interests which he had pursued throughout his career. He died in Heidelberg on 16 August , at the age of From Wikipedia, the free encyclopedia.

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If the holes are closed, the gas will only mix with ambient air at the point of combustion, that is, only after it has exited the tube at the top.

This reduced mixing produces an incomplete reaction, producing a cooler but brighter yellow, which is often called the "safety flame" or " luminous flame ".

The yellow flame is luminous due to small soot particles in the flame, which are heated to incandescence. The yellow flame is considered "dirty" because it leaves a layer of carbon on whatever it is heating.

When the burner is regulated to produce a hot, blue flame, it can be nearly invisible against some backgrounds. The hottest part of the flame is the tip of the inner flame, while the coolest is the whole inner flame.

Increasing the amount of fuel gas flow through the tube by opening the needle valve will increase the size of the flame.

However, unless the airflow is adjusted as well, the flame temperature will decrease because an increased amount of gas is now mixed with the same amount of air, starving the flame of oxygen.

Generally, the burner is placed underneath a laboratory tripod , which supports a beaker or other container. The burner will often be placed on a suitable heatproof mat to protect the laboratory bench surface.

A Bunsen burner is also used in microbiology laboratories to sterilise pieces of equipment [7] and to produce an updraft that forces airborne contaminants away from the working area.

Other burners based on the same principle exist. The most important alternatives to the Bunsen burner are:. From Wikipedia, the free encyclopedia.

Bunsen burner 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.

Bibcode : JChEd.. Oxford Companion to the History of Modern Science. Archived from the original PDF on November 9, Chemical Reactions — A compendium of experimental chemistry 8th ed.

Glasgow: R Griffin and Co. The development of modern chemistry. Courier Dover Publications. Retrieved 4 November Journal of Visualized Experiments 63 : A Text Book of Homoeopathic Pharmacy.

Domestic Science, Volume 2. London: Cambridge University Press. Laboratory equipment. Stands Clamps Holders. Dean—Stark Soxhlet extractor Kipp's.

Boston round. Cold finger Liebig. Evaporating Petri Syracuse Watch glass. Büchner Hirsch Dropping Separatory. Beaker Bell jar Gas syringe Vial.

Analytical chemistry. After numerous laborious purifications, Bunsen proved that highly pure samples gave unique spectra. In the course of this work, Bunsen detected previously unknown new blue spectral emission lines in samples of mineral water from Dürkheim.

He guessed that these lines indicated the existence of an undiscovered chemical element. He named the element "caesium", after the Latin word for deep blue.

The following year he discovered rubidium, by a similar process. In , Robert Bunsen together with Gustav Robert Kirchhoff were the first recipients of the prestigious Davy Medal "for their researches and discoveries in spectrum analysis".

Bunsen was one of the most universally admired scientists of his generation. He was a master teacher, devoted to his students, and they were equally devoted to him.

At a time of vigorous and often caustic scientific debates, Bunsen always conducted himself as a perfect gentleman, maintaining his distance from theoretical disputes.

He much preferred to work quietly in his laboratory, continuing to enrich his science with useful discoveries. As a matter of principle he never took out a patent.

He never married. Despite his lack of pretension, Bunsen was a vivid "chemical character", had a well-developed sense of humor, and is the subject of many amusing anecdotes.

When Bunsen retired at the age of 78, he shifted his work solely to geology and mineralogy , interests which he had pursued throughout his career.

He died in Heidelberg on 16 August , at the age of From Wikipedia, the free encyclopedia. Robert Bunsen. Göttingen , Westphalia , Rhine Confederation.

Heidelberg , Baden , German Empire. Discovery of cacodyl radical Discoveries of caesium and rubidium Discovery of use of the Bunsen burner Carbon-zinc electrochemical cell Methods of gas analysis Development of spectrochemical analysis.

Copley medal Davy Medal Albert Medal Chemistry career Geology and mineralogy retirement. Dmitri Mendeleev Julia Lermontova. His parish register , as well as two curricula vitae handwritten by Bunsen himself, support the claim that 30 March is Bunsen's true birth date; [1] [2] [3] [4] however, many later sources cite 31 March as the date.

Lockemann nevertheless regarded the 30th as the correct date. Deutsche Bunsen-Gesellschaft für Physikalische Chemie. Lebensbild eines deutschen Naturforschers , Wissenschaftliche Verlagsgesellschaft Stuttgart, , p.

Journal of the American Chemical Society. American Chemical Society. Russell, Phys. Retrieved 31 March from Encyclopedia. Bibcode : Natur..

School Science and Mathematics. The discovery of the elements 6th ed. Retrieved 16 September Bibcode : JChEd.. Justus Liebigs Annalen der Chemie.

Journal of Chemical Education. The Hexagon : 42— Retrieved 31 December Science History Institute. June

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