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Mathematical problems of burning wood
The three conditions of combustion are: 1. Oxygen 2. Combustible 3. The combustible temperature reaches or exceeds the ignition point.

Through the observation in real life, it is not difficult to find that the flame generally jumps upward.

After burning for a period of time, the first batten went out because of lack of combustible materials (battens).

The second batten always has enough fuel (batten) during combustion, so it will not go out.