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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 blue flame of a Bunsen burner has a temperature between 500 0C and 700 0C.
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.