Bunsen Flame

The blue flame is the hottest.

As you turn on the air hole completely, you may see that there is a blue flame surrounded by the yellow flame.

the Bunsen Flame is hot, but i think the blue flame is the hottest. But i can't make sure. If u want to know, u can touch it and try.. NO PAIN NO GAIN.

(kidding)

The middle part of the blue Bunsen flame is the hottest.

Reason:

The bottom part of the flame contains unburnt gas,so the temperature is not very hot.

The middle part of the Bunsen flame is completely burnt, so the temperature is the hottest.

The top part of the Bunsen flame: The flame area is smaller than middle, so its temp is not very hot too, as same as the bottom of flame.

The blue flame is the hottest since it is complete combustion
the Incomplete combustion contain unburn cabon molecules which show the yellow flame
Normally the edge of the blue bunsen flame is the hottest

The top of the blue flame (tip) is the hottest!!!!!