more oxygen
air hole closed- flame is the standard yellow-orange color air hole half open- flame is a violet-blue color air hole open- roaring blue flame
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.
When the air hole is opened completely then the flame would turn blue indicating it is very hot. If you closed it the flame will be yellow indicating that it is not as hot (also called the safety flame). So if you half opened the hole then the flame would be hot but not as hot as the blue flame, due to the air flow mixing with the gas inside.
The is an 'Air hole' at the bottom of the burner. This air hole has a slip collar , which can be twisted/turned/rotated in order to control the air flow. When the collar is turned such that the air hole is closed, then you have a 'slack' yellow flame. When the air hole is fully open , you have a 'roaring' pale blue flame. The temparture is controlled by the air hole too!!! . With the yellow flame is at its coolest, and with pale blue flame is at its hottest. However, you need a special heat resistant thermometer to insert in to the flame to read the actual temperature.
A roaring flame indicates that the air inlet is open too far and should be closed slightly.
Decide which flame to use. If the air hole on the Bunsen is open you will get a roaring flame a more gentle heat, close the air hole a Little flame will be quiet.
Blue or heating flame.
When the air hole is completely open, the flame is the hottest it can be. The fame turns blue. When the air hole is closed, the flame is yellow and its temperature is cooler.
air hole closed- flame is the standard yellow-orange color air hole half open- flame is a violet-blue color air hole open- roaring blue flame
Air hole fully open gives a 'roaring blue flame'
Green flame cuz when the air hole is closed it is yellow and when it is open it is blue so when the colors are combined they make the green flame
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.
A Bunsen burner flame is hottest when the air valve hole is open.
because the hole is closed, less oxygen is getting to the flame and therefore the flame cools down and is safe.
You think probable to a diffusion flame.
To heat chemicals or substances in science lab for experiment. There is an air hole in the Bunsen burner where you can screw loose to have open air hole that is the blue flame which is hotter. When there is a close air hole then the flame would be orange in color which is not as hot compared to the blue flame.
To get a roaring (blue) flame you simply turn the sleeve on the Bunsen burner's chimney to completely open the air hole under it. The new blue flame will be hard to see so close the air hole afterwards to make a visible flame.