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

Dear student,
Those substances which undergo combustion ( Can burn in air or oxygen ) are called combustible substance for example ; wood , coal etc.
While those which could not burn in air are called non combustible substances for example stone 

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Cumbustible substance can be burn easily In the presence of oxygen but non combustible substance cannot be burn easily The combustible substance are metals and non combustible substance could be metals or non metals
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