Question

A combustible substance can burn only when it has been heated to its​

Answer 1

answer: opposite material... i guess it work

Answer 2

hope it helps you

please mark my answer as brilliant

Explanation:

a combustible substance cannot catch fire or burn as long as its temperature is lower than its ignition temperature. ... But, if kerosene oil is heated a little, it will catch fire. But if wood is heated a little, it would still not catch fire.