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Why should the matchstick be held 1 cm below the nozzle when lighting the Bunsen burner?
Wiki User
∙ 9y ago
WHO is teaching you to light Bunsen burners with matchsticks? That is so unsafe and wrong. You can get burned really easily like that, and Bunsen burner burns are always bad. Go to a hardware store and spend $5 on a spark lighter, like welders use to light their torches. Those are a safe way to light your burner.
Wiki User
∙ 9y ago
Wiki User
∙ 13y agobecause it might explode
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What is Bunsen burner and how it is used?
When the University of Heidelberg hired Robert Bunsen in 1852, the authorities promised to build him a new laboratory building. Heidelberg had just begun to install coal-gas street lighting, so the new laboratory building was also supplied with illuminating gas. Illumination was one thing; a source of heat for chemical operations something quite different. Previous laboratory lamps left much to be desired regarding economy and simplicity, as well as the quality of the flame; for a burner lamp, it was desirable to maximize the temperature and minimize the luminosity. While his building was still under construction late in 1854, Bunsen suggested certain design principles to the university's talented mechanic, Peter Desaga, and asked him to construct a prototype. The Bunsen/Desaga design succeeded in generating a hot, sootless, non-luminous flame by mixing the gas with air in a controlled fashion before combustion. Desaga created slits for air at the bottom of the cylindrical burner, the flame igniting at the top. By the time the building opened early in 1855, Desaga had made fifty of the burners for Bunsen's students. Bunsen published a description two years later, and many of his colleagues soon adopted the design. 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 burner has a weighted base with a connector for a gas line (hose barb) and a vertical tube (barrel) rising from it. The hose barb is connected to a gas nozzle on the lab bench with rubber tubing. Most lab 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 via 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 (or rather oxygen) 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 an equimolar 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 a car's carburetor. 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. Increasing the amount of fuel gas flow through the tube by opening the needle valve will of course 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. The blue flame in a Bunsen burner is hotter than the red flame. Many lab accidents are related to burn injuries or exposed flames, and as a result new students are trained carefully in the use of a Bunsen burner. In general, the user should make sure that hair and clothing are secure, and unlikely to fall into the flame. In addition, flammable chemicals should be kept away from the Bunsen burner, and someone should remain by the burner at all times to supervise it. The flexible rubber hose connecting the Bunsen burner to the gas nozzle on the lab bench should also be secure, with no evidnce of leaking, and people should be cautious about touching things which have been exposed to the often considerable heat of a Bunsen burner, especially glass objects.
What is the difference between a shell nozzle and a regular nozzle?
About 2 inches
How does the gas on top of the liquid in an aerosol can cause the liquid to come not the spray nozzle?
Because the air in the can is being compressed, it can expand quite a bit when given the mean to. So when you press down on the nozzle, the air expands, pushing the liquid out.
Why does the Elmers glue cap twist to open and close?
Because they believe that is the best way to keep the nozzle clean.
Why does the stream of water travel farther when the nozzle of a hose is partially closed?
because you force it into a smaller space therefore you increase the pressure
Why should the matchstick be held in 1 cm below the nozzle when lighting the burner?
It doesn't need to be
What does the the nozzle do on a Bunsen burner?
The nozzle that the burner tubing connects to allows gas to enter into the burner. Also, the nozzle has a lever that allows you to control how much gas will flow into the burner.
What is the function of nozzle in Bunsen burner?
Shape the flame.
Where do you find the nozzle hole in Bunsen burner?
See the figure at thge link below.
Function of gas jet on a Bunsen burner?
it is used to burn the beaker .. ----
What is the function of nozzle for fire extinguisher?
The function of a rocket nozzle is to allow the thrust to be focuses and amplified. It also prolongs the burn time and greatly increases performance.
Where is the coldest part of the Bunsen burner?
The coldest part of the Bunsen Burner would be the gas inlet nozzle. Since expanding gasses absorb quite a bit of heat, the coldest portion would be where the gas first enters the burner. Now "whats the coldest part of a Buseb burners flame?", a completely different question. It' s the part closest to the ignition point.
How was the Bunsen burner invented?
The Bunsen burner was invented in the 1850s by Robert Bunsen, a German chemist. He designed it in collaboration with his laboratory assistant, Peter Desaga, to create a more efficient and controllable heat source for chemical experiments. The device quickly gained popularity for its ability to produce a clean, hot flame suitable for various laboratory applications.
What causes strike back in a Bunsen burner?
because of the gravity of the sun
Is a stationary co-nozzle referred to as a burner?
yes
What is the function of atomizing air in burner?
to sprate the oil same into tha nozzle.
What use of bernoulli's theory?
Bernoulli's therem used to tell about lift of an air craft wing, Blowing of roofs, Bunsen burner.In bunsen burner, the gas comes out of the nozzle with high velocity.Due to this the pressure in the stem of burner decreases. So air from the atmosphere rushers into the burner. During a storm, the roofs of huts or tinned roofs are blown off without any damagd to other parts of the hut. The blowing wind creates a low pressure on the top of the roof. The pressure under the roof is however greater than on the roof. Due to this pressure difference, the roof is lifted and blown off with the wind./
