Chapter 6 - Combustion and Flames

Pregunta	Respuesta
1) What is combustion? - A chemical process in which a substance reacts with oxygen to give off heat is called combustion 2) What are fuels? - Substances that undergo combustion and produces heat energy are called fuels	3) Distinguish between combustible & non combustible substances - i. Combustible substances The substances that undergo combustion are called combustible substances. eg :- wood, paper ii. Non - Combustible substances The substances that does not undergo combustion are called non - combustible substances eg :- bricks, glass
4) Give examples for :- a) Solid Fuels :- wood and coal b) Liquid Fuels :- kerosene and diesel c) Gaseous Fuels :- LPG (liquified petroleum gas) and CNG (compressed natural gas)	5) Define ignition temperature - The lowest temperature at which a substances catches fire is called its ignition temperature 6) What are the conditions necessary for the combustion? - i. Presence of oxygen ii. Presence of combustible substances iii. Attainment of ignition temperature

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