There is no equation for a flame. You can try to write an equation for the reactions happening in the region we call the flame. I presume you mean when the air hole is closed and the flame is yellow. There is no one simple equation, as several reactions are going on, but this one accounts for the formation of the soot particles which give the flame its yellow colour:
CH4 +O2 --> C + 2H2O
Because it is 'dirty', meaning it leaves soot. Also because it isn't that hot.
a Bunsen burner flame can be 20* to 2000*
you would use the safety flame when not heating anything because the blue flame is for heating because its hotter than yellow.
The oxygen necessary for burning is not sufficient.
The blue flame is called a roaring flame and the yellow flame is called the safety flame.
The blue flame of the Bunsen burner is when it is hottest. The yellow flame is the safety flame. you should always start the burner on the safety flame which is produced when the holes on its base are closed.
Safety flame
As a safety flame, keep it on this if the burner is not in use :)
The yellow flame because that is the safety flame
In the fire
It is closed to make a safety flame.
Because it is 'dirty', meaning it leaves soot. Also because it isn't that hot.
The safety flame, the cold one, is wavy.
Safety flame medium flame roaring flam
a Bunsen burner flame can be 20* to 2000*
The silent flame on the Bunsen burner is the yellow/orange flame.
You twist the bottom to change it from a safety flame, blue flame or just a normal flame.