Question

What is the difference between combustible and non-combustible substance?

Answer 1

Hint: We can understand a combustible substance by the example of wood and a non-combustible substance by stone. Now think what could be the differences.

Complete step by step answer:
Combustion, or burning, is a high-temperature exothermic redox chemical reaction between a fuel and an oxidant, usually atmospheric oxygen, that produces oxidized, often gaseous products, in a mixture termed as smoke.
The degree of flammability or combustibility in air depends largely upon the volatility of the material
The difference between the combustible and non-combustible substances are explained below.
Combustible substance - A substance which burns in air and tends to produce heat and light is known as Combustible substances.
To burn these, necessary ingredients are – Heat, fuel and air
Examples – Diesel, petrol, kerosene.
Non-combustible substances - Non-combustible substances are certain substances which are not combustible in the presence of air.
These will not burn on being exposed to flame.
Examples – Glass, stones

Note: A combustible material is something that can combust (burn) in air. Flammable materials are combustible materials that ignite easily at ambient temperatures.
In other words, a combustible material ignites with some effort and a flammable material catches fire immediately on exposure to flame.