The paper must touch the flames because when the flames go near the paper the heat travels to the paper making it burn.
Explanation:
1.The closer the paper from the flame, the higher the energy transfer (from the fire to the paper). Therefore, the paper must be at its closest distance from the flame to have the volume of energy required to burn the paper. The distant the paper from the flame, the minor the energy transfer (from the flame to the paper).
2. The closer the paper from the flame, the higher the energy transfer (from the flame to the paper).
Therefore, the paper must be at its adjacent distance from the flame to have the outlay of energy required to burn the paper.
