Question

give reason why some substances cat fire by its own​

Answer 1

Answer:

If the clothes of a person catch fire, he is immediately wrapped in a thick blanket. The blanket cuts off the supply of air i.e. the supporter of combustion and hence the fire is put off.

Let us we some more activities to team more about combustion.

Answer 2

Answer:

The substances which have very low ignition temperature and can easily catch fire with a flame are called inflammable substances. For example petrol, alcohol, gasoline,etc

Hope that this answer will help you!