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The substance which undergoes combustion is called combustible substance

Or, in easy language

Substance which can burn in air is called combustible substance

Example - Petrol, Diesel, Kerosene oil, Charcoal, Wood, Alcohol, Magnesium

 

Similarly,

Those substances which cannot burn in air are called incombustible substance

Example - Stone, Glass, Cement, Brick, Water, Sand

 

A combustible substance is also called fuel

 

Difference between Combustible and Noncombustible Substance

Combustible substance

Non Combustible Substance

Substance which reacts with oxygen to produce heat and light is called combustible substance

Substance which does not react with oxygen to produce heat and light is called Non combustible substance

In easy language, those substance which burn in air (or undergo combustion)are called combustible substance

In easy language, those substance which do not burn in air (or do not undergo combustion)are called non combustible substance

Example - Magnesium, Coal, Kerosene

Example - Glass, Stone

Questions

NCERT Question 1 - List conditions under which combustion can take place.
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CA Maninder Singh is a Chartered Accountant for the past 12 years and a teacher from the past 16 years. He teaches Science, Accounts and English at Teachoo