Question

define : combustion,combustible substance and combustilbe material​

Answer 1

Combustion is the process of burning something.

Combustible substance is something that easily catches fire.

Combustible material is something that can be heated up to give flame in order to ignite something.

Answer 2

Answer:

Cumbustion:-

the chemical process in which a substance burns in air or oxygen with the release of heat and light energy is called cumbustion.

Cumbustible substance:-

The substance that undergoes combustion is called a combustible substance.

Cumbustible material:-

The materials which on heating in presence of air or oxygen ,catch fire easily and produce heat and light energy ,is called cumbustible material.