Question

(2) Which activity would you do to prove that the temperature of a substance must reach
the combustion point of that substance in order to ignite it?
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Answer 1

Explanation:

For e.g if you want to burn wood, you must have noticed, that when you take a block of wood, it does not burn right away. First, it requires to get heated up, then it burns. 3. Thus, it shows that ignition temperature is required for a substance to burn.