Because if the air hole was wide open, the flame will be blue, which is going to be really hot so you have to leave it at a safety yellow flame which is when the air hole is closed when lit. It could be dangerous to leave a Bunsen burner on a blue flame.
this is confusing, explain more clearly, geez is dat too much to ask?
because when you close the airhole it turns onto a yellow falme(also known as safety flame) it must be on the yellow flame so you can see it , when you want to heat somethin over the Bunsen burner that's when you have it opened on the blue flame because the blue flame is the hottest flame.
To save burning yourself.
Allowing the air in, causes the Bunsen to burn with an intense, blue, hot flame. Lighting it in this way may cause burns.
With the hole shut, the flame is yellow and comparitively cool, you can even pass your hand through it, without being burned.
It Stops The Air Mixing With The Gas The Less Air Produces A Cooler Flame Its Safer
huh, oh yeah.... cos u will be caught on fire
Oxygen is mixed with fuel gas through the holes without oxygen combustion process does not occur.
Ch4 + 5o2 ------> co2 + 2h2o +302
The first step in lighting a Bunsen burner is to check for safety. Next you make sure the holes are closed, light the match, turn on the gas tap, and put the match to the top of the burner. Once lit, you adjust the flame.
When the air valve in closed a yellow luminous flame is observed due to carbon particles from in incomplete combustion.
With oxygen closed off and a yellow flame the temperature is about 1000 degrees Celsius.
Robert Bunsen added an air hole to it so it could have oxygen as well as gas. when the air hole is open the flame you get is blue and is hotter than when the air hole is closed, which then gives a yellow flame.
The safety flame on a Bunsen burner is typically the smallest, pale blue flame that has a well-defined inner cone. This flame is less likely to produce soot or cause accidental fires compared to larger, more intense flames.
Nothing much really. Just don't touch the flame, wear goggles and that's all. Using a safety mat is unnecessary and it doesn't really matter if you keep the airhole at the base open or closed.
The blue flame of a Bunsen burner is caused by complete combustion of the gas. It indicates that the gas is burning efficiently and at the hottest possible temperature. The blue flame is preferred for heating and sterilizing purposes in laboratories.
It is closed to make a safety flame.
It is a luminous yellow flame. 🔥
its a orange colour when closed and a blue colour when is open
The four(4) flame types of Bunsen burner is depending on flow through the throat holes (holes on the side of the Bunsen burner -- not to be confused with the needle valve for gas flow adjustment). 1) air hole closed (Safety flame used for when not in use or lighting). 2) air hole slightly open. 3) air hole half open. 4) air hole almost fully open (this is the roaring blue flame).
Ch4 + 5o2 ------> co2 + 2h2o +302
it's to prevent a strike-back
The "air-hole" of a bunsen burner allows some of the flame to escape so that the heating flame does not become too hot. A flame that is too hot can damage laboratory equipment. When the air hole is closed it is a yellow sooty flame like the fires we have at home.
The first step in lighting a Bunsen burner is to check for safety. Next you make sure the holes are closed, light the match, turn on the gas tap, and put the match to the top of the burner. Once lit, you adjust the flame.
When the air valve in closed a yellow luminous flame is observed due to carbon particles from in incomplete combustion.