Question

To set fire to a combustible substance, you have to heat it to a certain minimum temperature. What is this minimum temperature called ? If this minimum temperature is very low for a certain substance, what is the substance called ?

Answer 1

If a substance has a very low ignition temperature that is the burning temperature then the substance is called an inflammable substance. Inflammable substances are those substances which have a very low ignition temperature and can burn even with a flame. Example - petrol.