|
Fire
Science: Ignition While friction is used to ignite a match, the heat energy from a match can be used to ignite paper, candlewicks, etc. The heat from the energy in lightning can ignite fuel such as trees, grass, and houses. Photo: Courtesy of www.arttoday.com In the case of solid fuels such as wood, ignition is actually a two-step process. During the first step, energy such as heat causes some of the solid fuel molecules to move and break loose. These molecules are released into the air as a gas or vapor. During the second step, called pyrolysis, energy causes the gas molecules given off by the heated solid fuel to vibrate. The gas molecules then break into pieces. These gas molecules are what a person actually sees burning during a campfire, not the wood itself. This is important because how a fire spreads from the initial source of fuel to other nearby sources of fuel partly depends on how the gases move around. Combustion
..|..
Ignition
..|..
Fuel |
HTML code by Chris
Kreger Some images © 2004 www.clipart.com Privacy Statement and Copyright © 1997-2004 by Wheeling Jesuit University/NASA-supported Classroom of the Future. All rights reserved. Center for Educational Technologies, Circuit Board/Apple graphic logo, and COTF Classroom of the Future logo are registered trademarks of Wheeling Jesuit University.
|