Question: What Is Fire Made Of?
You know that fire generates heat and light, but have you ever wondered what it is made of? Here is a look at the chemical composition of fire.
Answer: Fire is the result of a chemical reaction, called combustion. At a certain point in the combustion reaction, called the ignition point, flames are produced. Flames consist primarily of carbon dioxide, water vapor, oxygen and nitrogen. Fire emits heat and light. In order for combustion and fire to occur, three things must be present: fuel, oxygen and energy (usually in the form of heat).
ReferencesState of Matter of Fire
On Fire, Adobe Flash-based science tutorial from the NOVA television series.