Prove that the burning takes place within the fire? by using?
Answer:
Use the match to light the candle (read the instructions on the matchstick as necessary). Wait a few minutes for the flame to stabilize. Suddenly place the toothpick into, across, and half way up the flame. Wait a second or two until charring just begins, then remove (and blow out if lit). You now have a visual indication of temperature within the flame.
Cellulose ignites just below 233 C.,
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