How does a fire ignite?

How does a fire ignite?

Richard Saferstein (Former Chief Forensic Scientist) gives expert video advice on: How does a fire ignite?; How does learning where the fire originated help in CSI?; How does a fire grow? and more...

A fire ignites when a fuel comes into contact with a heated source that is hot enough to vaporize the fuel and if you have oxygen in the area. You then have a vapor fuel. You then have oxygen and you then have a heat source and those are the three important ingredients of fire. You'll have fire. You need heat, you need fuel in a vapor state and you need oxygen.