Final answer:
A combustible is capable of igniting and burning. It refers to a substance that can undergo combustion, which is a chemical reaction that releases heat, light, and often produces flames.
Step-by-step explanation:
A combustible is capable of igniting and burning. It refers to a substance that can undergo combustion, which is a chemical reaction that releases heat, light, and often produces flames. Combustible materials include wood, paper, gasoline, and natural gas.