(a) Combustible substances — charcoal, straw, card board, paper, candle wood,

(b) Non-combustible substances — chalk, stone, iron rod, copper coin, glass.

Combustible substances: Those substances which undergo combustion or burn are called combustible substances.

For example: Paper, cloth, cooking gas (LPG), CNG, Kerosene oil, wood, charcoal, etc.

Non-Combustible substances: Those substances which do not undergo combustion are called combustible substances.

For example: Stone, cement, bricks, soil, sand, water, iron nails, etc.

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